544 pages, illustrated, navy blue linen cover and red paper dust jacket.non-fictionThis revised edition follows the previous editions in giving a practical guide to navigation and pilotage which, although written primarily for naval officers, will be suitable for all students of navigation. Astronomical navigation and meteorology can be read in Volume II of this manual. The quality of detailed thoroughness that has always distinguished this book is retained, and it has been brought up to date, particularly in the chapters on radio aids to navigation and navigational instruments.howard timbury, first fleet fellowship victoria, interest group, navigation, education

An octant is an astronomical instrument used in measuring the angles of heavenly bodies such as the sun, moon and stars at sea in relation to the horizon. This measurement could then be used to calculate the altitude of the body measured, and then the latitude at sea could also be calculated. The angle of the arms of an octant is 45 degrees, or 1/8 of a circle, which gives the instrument its name. Two men independently developed the octant around 1730: John Hadley (1682–1744), an English mathematician, and Thomas Godfrey (1704–1749), a glazier in Philadelphia. While both have a legitimate and equal claim to the invention, Hadley generally gets the greater share of the credit. This reflects the central role that London and the Royal Society played in the history of scientific instruments in the eighteenth and nineteenth century's. There were also two others who are attributed to having created octanes during this period, Caleb Smith, an English insurance broker with a strong interest in astronomy (in 1734), and Jean-Paul Fouchy, a mathematics professor and astronomer in France (in 1732) In 1767 the first edition of the Nautical Almanac tabulated lunar distances, enabling navigators to find the current time from the angle between the sun and the moon. This angle is sometimes larger than 90°, and thus not possible to measure with an octant. For that reason, Admiral John Campbell, who conducted shipboard experiments with the lunar distance method, suggested a larger instrument and the sextant was developed. From that time onward, the sextant was the instrument that experienced significant development and improvements and was the instrument of choice for naval navigators. The octant continued to be produced well into the 19th century, though it was generally a less accurate and less expensive instrument. The lower price of the octant, including versions without a telescope, made it a practical instrument for ships in the merchant and fishing fleets. One common practice among navigators up to the late nineteenth century was to use both a sextant and an octant. The sextant was used with great care and only for lunar sightings while the octant was used for routine meridional altitude measurements of the sun every day. This protected the very accurate and pricier sextant while using the more affordable octant for general use where it performs well. The invention of the octant was a significant step in providing accuracy of a sailors latitude position at sea and his vessels distance from land when taking sightings of land-based landmarks.Octant with metal handle, three different colored shades are attached, in wooden wedge-shaped box lined with green felt. Key is attached. Two telescope eyepieces are in box. Some parts are missing. Oval ink stamp inside lid of box, scale is graduated to 45 degrees. Ink stamp inside lid of box "SHIPLOVERS SOCIETY OF VICTORIA. LIBRARY"instrument, flagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, octant, navigation, nautical instrument, navigation instrument, john hadley, sextant, astronomical instrument

This magnetic compass is a good size to fit easily into a person's pocket or personal luggage and is protected from knocks by its wooden case. It could have been used for reference when travelling on land or sea. There is no visible manufacturer's mark, which may mean that it was not of high monetary value. Leith is a district of Edinburgh in the country of Scotland, the U.K. It was once the Port of Edinburgh and many migrant ships departed from here bound for the Australian colony. It had a busy shipbuilding industry, with wet and dry docks. It appears from the inscription on the case "Chas Gray, LEITH, 1839" that this pocket compass once belonged to Charles M. Gray (Chas is a common abbreviation for the name Charles). The inscription coincides with the name, place and date that the Western Victorian pioneer Charles M. Gray left Scotland and arrived in Australia. Charles Gray was born in Anstruther, Scotland, in 1818. His family was connected with the Royal Marines, which may have created his nautical instruments such as this pocket compass. Charles Gray arrived in Hobson's Bay on 15 June 1839 on the ship “Midlothian”. That same ship had departed from Leith, Scotland on February 15th 1839. Did Charles Gray acquire the pocket compass in Leith, perhaps as a gift or a souvenir of his motherland? Charles Gray was an early squatter and went on to become a very successful settler as a sheep pastoralist in the Western District of what is now Victoria (originally the colony of New South Wales). He and his wife had a large property called “Nareeb Nareeb”, Green Hill Creek District (now Glenthompson), Victoria, from 1840-1886. He was also a local Councillor and Justice of the Peace, and had an interest in the local indigenous people; he named his property after their tribe. Charles returned to England in 1890 and died there in 1905. Charles Gray had written an account in 1890 of his life at Nareeb Nareeb, called Western Victoria in the Forties: "REMINISCENCES OF A PIONEER The Western District in the 1840's By Charles Gray" , a valuable historical reference to colonial Victoria. His book was published by the Hamilton Spectator in 1932. Charles Gray's photograph is one of 713 historical photographs of early Victorian settlers, created as a montage by Thomas Foster Chuck in 1872. The State Library of Victoria holds the framed montage titled “The Explorers and Early Colonists of Victoria”. To qualify for inclusion on this montage the Settlers must have arrived in Victoria before 1843. Charles Gray's photograph is number 349! The pocket compass is associated with Charles Gray, one of the early squatters and settlers in Western Victoria, possibly given to him as a parting gift on his emigration to Van Diemans land in 1839. The item is very significant as it's connection with one of Victoria's early pioneers is well provenanced by the inscriptions on the wooden case. Pocket compass, brass, set into a square wooden case with hinged lid and small hook catch. Compass is marked with 360 degrees and compass points and has two pointers; one to show magnetic north and one to set the direction of travel. Hinges are triangular and inset into the wood. The lid has an attached brass plaque with the inscription "Chas Gray, Leith, 1839" (It likely belonged to Charles Gray, Leith, UK, who migrated to Port Philip Australia in 1839 and became a successful pastoralist.) “Chas Gray / LEITH / 1839” engraved on brass plaque on lid.flagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, magnetic compass, pocket compass, charles m. gray, chas gray, migrrant from leith 1839, charles gray anstruther, scottland, ship midlothian 1839, squatter western victoria, settler western victoria, hobson's bay port phillip australia, charles gray nareeb nareeb - green hill creek district, western victoria in the forties: reminiscences of a pioneer by charles m. gray 1890, leith edinburgh u.k., western victoria in the forties: reminiscences of a pioneer - montage by thomas foster chuck 1872, charles gray, reminiscences of a pioneer, the western district in the 1840's, compass, scientific instrument, nautical instrument, direction, directional compass, navigation

Langlands Company History: Langlands foundry was Melbourne's first foundry and iron shipbuilder established in 1842, only 8 years after the founding of the Victorian colony by two Scottish immigrants, Robert Langlands and Thomas Fulton, who had formed a partnership before emigrating (1813–1859). The business was known as the 'Langlands Foundry Co'. Henry Langlands (1794-1863), left Scotland in 1846 with his wife Christian, née Thoms, and five surviving children to join his brother Robert. By the time he arrived in early January of 1847 the partnership of Robert Langlands and Fulton had dissolved as Fulton had gone off to establish his own works. It was at this time that the two brothers took over ownership of Langlands foundry. Several years later Robert retired and Henry became sole the proprietor. The foundry was originally located on Flinders Lane between King and Spencer streets. Their sole machine tool, when they commenced as a business, was a small slide rest lathe turned by foot. In about 1865 they moved to the south side of the Yarra River, to the Yarra bank near the Spencer Street Bridge and then in about 1886 they moved to Grant Street, South Melbourne. The works employed as many as 350 workers manufacturing a wide range of marine, mining, civil engineering, railway and general manufacturing components including engines and boilers. The foundry prospered despite high wages and the lack of raw materials. It became known for high-quality products that competed successfully with any imported articles. By the time Henry retired, the foundry was one of the largest employers in Victoria and was responsible for casting the first bell and lamp-posts in the colony. The business was carried on by his sons after Henry's death. The company was responsible for fabricating the boiler for the first railway locomotive to operate in Australia, built-in 1854 by Robertson, Martin & Smith for the Melbourne and Hobson's Bay Railway Company. Also in the 1860s, they commenced manufacture of cast iron pipes for the Board of Works, which was then laying the first reticulated water supply system in Melbourne. Langlands was well known for its gold mining equipment, being the first company in Victoria to take up the manufacture of mining machinery, and it played an important role in equipping Victoria's and Australia's first mineral boom in the 1850s and 1860s. Langlands Foundry was an incubator for several engineers including Herbert Austin (1866–1941) who worked as a fitter at Langlands and went on to work on the Wolesely Shearing machine. He also founded the Austin Motor Company in 1905. Around the 1890s Langlands Foundry Co. declined and was bought up by the Austral Otis Co. in about 1893. History for Grimoldi: John Baptist Grimoldi was born in London UK. His Father was Domeneck Grimoldi, who was born in Amsterdam with an Italian Father and Dutch mother. Domeneck was also a scientific instrument maker. John B Grimoldi had served his apprenticeship to his older brother Henry Grimoldi in Brooke Street, Holburn, London and had emigrated from England to Australia to start his own meteorological and scientific instrument makers business at 81 Queens St Melbourne. He operated his business in 1862 until 1883 when it was brought by William Samuel and Charles Frederick, also well known scientific instrument makers who had emigrated to Melbourne in 1875. John Grimoldi became successful and made a number of high quality measuring instruments for the Meteorological Observatory in Melbourne. The barometer was installed at Warrnambool's old jetty and then the Breakwater as part of the Victorian Government's insistence that barometers be placed at all major Victorian ports. This coastal barometer is representative of barometers that were installed through this government scheme that began in 1866. The collecting of meteorological data was an important aspect of the Melbourne Observatory's work from its inception. Just as astronomy had an important practical role to play in navigation, timekeeping and surveying, so the meteorological service provided up to date weather information and forecasts that were essential for shipping and agriculture. As a result, instruments made by the early instrument makers of Australia was of significant importance to the development and safe trading of companies operating during the Victorian colonies early days. The provenance of this artefact is well documented and demonstrates, in particular, the importance of the barometer to the local fishermen and mariners of Warrnambool. This barometer is historically significant for its association with Langlands’ Foundry which pioneered technology in the developing colony by establishing the first ironworks in Melbourne founded in 1842. Also, it is significant for its connection to John B Grimoldi who made the barometer and thermometer housed in the cast iron case. Grimoldi, a successful meteorological and scientific instrument maker, arrived in the colony from England and established his business in 1862 becoming an instrument maker to the Melbourne Observatory. Additional significance is its completeness and for its rarity, as it is believed to be one of only two extant barometers of this type and in 1986 it was moved to Flagstaff Hill Maritime Village as part of its museum collection. Coast Barometer No. 8 is a tall, red painted cast iron pillar containing a vertical combined barometer and thermometer. Half way down in the cast iron framed glass door is a keyhole. Inside is a wooden case containing a mercury barometer at the top with a thermometer attached underneath, each with a separate glass window and a silver coloured metal backing plate. Just below the barometer, on the right-hand side, is a brass disc with a hole for a gauge key in the centre. The barometer has a silvered tin backing plate with a scale, in inches, of "27 to 31" on the right side and includes a Vernier with finer markings, which is set by turning the gauge key. The thermometer has a silvered tin backing plate with a scale on the left side of "30 to 140". Each of the scales has markings showing the units between the numbers.Inscription at the top front of the pillar reads "COAST BAROMETER" Inscribed on the bottom of the pillar is "No 8". and "LANGLANDS BROS & CO ENGINEERS MELBOURNE " The barometer backing plate is inscribed "COAST BAROMETER NO. 8, VICTORIA" and printed on the left of the scale, has "J GRIMOLDI" on the top and left of the scale, inscribed "Maker, MELBOURNE". There is an inscription on the bottom right-hand side of the thermometer scale, just above the 30 mark "FREEZING" Etched into the timber inside the case are the Roman numerals "VIII" (the number 8)flagstaff hill, warrnambool, maritime village, maritime museum, flagstaff hill maritime museum & village, shipwreck coast, great ocean road, warrnambool breakwater, coast barometer, coastal barometer, barometer, weather warning, ports and harbours, fishery barometer, sea coast barometer, austral otis co, coast barometer no. 8, henry grimoldi, henry langlands, john baptist grimoldi, langlands foundry co, meteorological instrument maker, robert langlands, scientific instrument maker, thermometer, thomas fulton

The John E. Hand & Sons Company was founded in Philadelphia in 1873, quickly gaining a reputation as competent manufacturers of nautical instruments and compass adjusters. In fact, John Enos Hand, the company founder, is recognised as the first man in America to adjust a compass aboard an iron ship. The Hand Company built navigational equipment for all varieties of floating vessels, and operated a chain of retail outlets with “service stations” in numerous port cities, including Baltimore and New Orleans, until 1956. Service stations sold Hand instruments as well as other nautical paraphernalia and provided compass adjusting services. Additionally, John E Hand and his two sons, John L Hand and Bartram Hand, were inventors in their own right who patented design improvements for numerous instruments that were employed in the company’s work. Commercial and private contracts dominated the firm’s business until the late 1930s when the United States military began preparations for World War II. Although the Hand Company never completely abandoned its involvement with private industry, after World War II, military contracts monopolised their business. The Company obtained contracts with the Navy, Coast Guard and Marines to develop new instruments, and to build military-engineered nautical equipment. Of note are the wrist compass, developed for the Navy beginning in the 1950s, and the Mark VII Model 5 Navy Standard Binnacle. Although it moved numerous times, the Hand Company headquarters and factory remained in the Delaware Valley, occupying several buildings in Philadelphia and southern New Jersey. Maintaining its central office in Philadelphia well into the 1900s, the factory was moved to Atco, New Jersey around the turn of the twentieth century and subsequently to Haddon field, New Jersey. It moved one last time in the 1960s to Cherry Hill, New Jersey. In 1997, California-based Sunset Cliffs Merchandising Corporation purchased the Hand Company and all its assets for $100,000. "HAND" brand taffrail log by John F. Hand and Sons Co. Register is enclosed in log, has a glass front and 3 dials on an enameled surface, the first dial registers the miles up to 100, the second registers the units up to 10 mile, the third registers quarters of a mile. The item is rocket shaped with a three blade rotor and a rope ring attachment at one end; the rotor will spin when a rope is attached, allowing the apparatus dials to measure the ship's speed when it is dragged behind a ship. Diagram of the 'Hand' trademark with a compass card in the middle, inscription reads "John F Hand and Sons Co" and "PHILA-BALTO" ( Abbreviation for: Philadelphia / Baltimore) flagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, bartram hand, john enos hand, john f. hand and sons co, john l hand, john hand & sons instrument makers, john hand & sons of philadelphia, marine instrument, marine service station, mechanical ship log, nautical instrument, nautical navigation, navigational equipment, scientific instrument, ship log, ship log register, ship’s speed, sunset cliffs merchandising corporation, speed log, rocket log, harpoon log, taffrail log, taff rail log

A ship's rudder indicator is used for measuring the angle of slope or pitch of the vessel. The information can be used to adjust the steering of the ship to give safe navigation. The rudder indicator transmitter once contained in this box was battery operated, according to the label inside this box. Box, wooden, used to store a battery operated Siemen's ship's rudder indicator. Made in the United Kingdom. Descriptive leaflet glued inside hinged lid. Lid secured by hooked catch. Brass latch. Metal mounting plate. Hole drilled in back. Dovetail joints. flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, siemen's brothers london, siemen's rudder indicator box, nautical instrument for measuring pitch or slope, scientific instrument box, navigational instrument box

This item is possibly the sextant donated to the Ballarat School of Mines Museum on 21 October 1885 by D. Turpie of Ballarat.Timber (ebony?) framed sextant with ivory scale, brass radial arm and ivory vernier scale. Mirrors and viewer are set in brass.Maker's label inside the hinged lid.sextant, scientific instrument, d. turpie, navigation, ballarat school of mines museum

In times past the only way to measure a ship’s speed was to throw a wood log into the water and observe how fast it moved away from the ship. In the 16th century, the log was fastened to a rope knotted at set intervals. The log was thrown over the stern (back) of the vessel and a crew member counted the number of knots that were paid out in a set time. From this, they could estimate the vessel's speed through the water. This was known as streaming the log and is also the derivation of the knot as a measurement of nautical speed. Various manufacturers of nautical equipment had sought over the years to perfect the operation of determining a ship's speed and it wasn't until Thomas Walker and his son Ferdinand developed a mechanical system that eventually made this task became easy for marine navigators. Thomas Walker & Son were internationally renowned in the manufacturing of ship logs the founding father, Thomas Walker (1805–1871), an engineer in Birmingham, patented his mechanical log in 1878 which was a recording instrument that attached to a rail at the stern of a vessel connected by a long cord with a rotor which was towed behind the ship. The instrument dial then recorded the distance travelled. Thomas Walker first went into business to manufacture stoves at 58 Oxford Street Birmingham. Walker’s self-feeding stove was widely lauded at the Paris Exhibition of 1855, winning a prize medal and kickstarting the first of many notable innovations for the Walker family's manufacturing business. However, it wasn’t until working on an earlier ship’s log model invented by his Uncle that Thomas Walker became interested in the further development of this device, used to ascertain a ship’s speed. Walker continued to improve on the common log for the company of Massey & Sons and these improvements were deemed revolutionary. This log became a firm favourite of the West India Association (a British-based organisation promoting ties and trade with the British Caribbean), being the most common log in use for two generations. It took until 1861 for Thomas Walker and his son, Thomas Ferdinand Walker (1831-1921) to patent the first Walker log of many. Together, with the introduction of the A1 Harpoon Log two years later, they established the Walker Log Business as a force to be reckoned with. By his passing in 1871, Thomas Walker Snr had not only founded a family business with considerable staying power but also instilled a tradition of public service. Having sat as a representative on the Birmingham Town Council for 15 years and played an active role in public works, he was soon given the nickname of ‘Blue Brick Walker’. Much like his father, Thomas Ferdinand Walker changed the face of the maritime industry. His patent of 1897, the ‘Cherub’ log, was a notable departure from the past providing a far more accurate reading and replacing the majority of logs of the age. They were the first to produce an electric log (Trident) and the Walker factory was one of the first to introduce the 48-hour work week for employees.The ship log was invented and made by a significant marine instrument maker and innovator of machinery. It demonstrates the huge leap taken to improve navigational accuracy at sea with an instrument that was in use for decades.Ships Log, Walker Trident electric motor, in wooden box with instructions inside box. The motor dial with electric cord is still inside box.Inscription "Admiralty patent number 3332" and "Walker Trident Electric Ship Log (Mark III), 15-25 volt". On top of lid, hand written, is "G TAYLOR"flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, ships log, thomas walker & son, electric ships log, marine navigation, thomas ferdinand walker, ship log

In 1947, the scientific instrument manufacturing firms of  Henry Hughes & Son Ltd, London, England, and  Kelvin Bottomley & Baird Ltd, Glasgow, Scotland, came together to form Kelvin & Hughes Ltd. Hughes Company History: Henry Hughes & Sons were founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as “Henry Hughes & Sons Ltd” in 1903. In 1923, the company produced its first recording echo sounder and in 1935 a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing “Marine Instruments Ltd”. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd. Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S. Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military use. (See Note section this document for further information on the company's origins) This model binnacle and compass is a good example of the commercial diversity of navigational instruments made by Kelvin & Hughes after world war 2. It was made in numbers for use by shipping after the second world war and is not particularly rare or significant for its type. Also, it was made no earlier than 1947 as the firms of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd who took over from Smith & Sons were not amalgamated until 1947. It can there for be assumed that this item was made during the company's transitional period to Kelvin & Hughes from Smith Industries Ltd.Mid 20th century ship's binnacle with Kelvin Hughes/ F. Fuselli Genova 8 inch diameter (glass) compass on gimballed ring. Round, teak wood pedestal with mounted brass compensating sphere brackets and painted iron balls one green the other red. Heavy brass helmet style compass cover with hinged front door and removable top for compass viewing and natural lighting. A single handle is located on the side and single burner on the opposite side. Retains an old finish and some wear to the pedestal base. Binnacle marked Serial No 163 "Veritas" Made by Kelvin Hughes Compass marked "Kelvin Hughes & Made in Great Britain Serial No 760 C J"flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village

This megaphone's conical shape amplifies the sound from the narrow end and would have been used to signal a warning or give instructions. Its design is similar to an earlier brass fog horn used on a marine vessel, as it has a wide brim that allows it to be free-standing, and a shoulder rope makes it portable and frees up the user's hands. The narrow end is shaped into a mouthpiece. The megaphone may have been used at sea foghorn on a vessel, although it has no reeds for the sound, or used by a leader of a band or a fireman or other similar uses. This megaphone's conical shape is based on the centuries-old ram's horn or horn from other animals, used to amplify sound to make it travel a long distance or be heard above other sounds. It represents a similar instrument made in the 19th century and used as a signal or to give instructions, such as on a vessel at sea, to a lifesaving team, or in a marching band. Megaphone; brass conical shape with an opening at both ends and a join near the wide end. The wide opening has a broad brim and is painted red inside. A brass ring is attached near each opening and a narrow rope is attached to each ring. warrnambool, flagstaff hill maritime museum and village, fog horn, marine equipment, navigation, warning signal, maritime, nautical, fireman, captain, shoulder rope, signal, safety equipment

This compass is the type used by an artillery unit of the Australian Military Forces during World War 2 and made by J W Handley. Although having owned the factory site since 1935 at 657 Victoria St J W Handley began to produce various items for the Australian Military forces after purchasing and expanding the factory to 655 Victoria St. It appears that he, or some one else may already have been occupying the site for industrial purposes, such as (Manufacturing, Foundry and Electroplating) since at least 1929. J W Handley Pty Ltd was actively producing items for the Military during the war years, a newspaper article from 1939 shows the factory in production and employing 420 people during 1939. J W Handley after the war moved into producing other non military items including a range of fishing reels. The company ceased trading in 1987 and was deregistered as J W Handley Pty Ltd in 1990.The item demonstrates the industrial capability of Australia at the start of World War 2, this item is actively sort by collectors of Australian Military memorabilia and represents a time in Australian history when the country was at war and the general population was concerned about an invasion from Japanese forces. It also therefor is of social significance as many Australians served in the Military forces at that time and the item is complete and in very good condition.A plane table compass, sometimes referred to as a trough compass, used by surveyors and artillery crew to accurately establish magnetic north. The compass is precision machined of brass material with a long needle to ensure accuracy. The compass scale is marked with a centre zero (for magnetic north) and graduations indicating plus and minus five degrees. The compass is housed in a protective wooden case with a sliding lid. The lid has a brass slide which locks the compass needle during periods when the compass is not in use.J.W.H./V Mark 11 D�D. Made by J W Handley Richmond Melbourne, Victoria. Serial number 1333 on boxflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, trough compass, navigation instrument, surveyor's instrument, j w handley, artillery, australian army, trough, plane compass, world war 2

Negretti and Zambra 1850-1980s were optical instrument makers and mathematical instrument makers based in London, England. The firm of Negretti and Zambra was established in 1850 by Henry Negretti and Joseph Zambra who had formed a partnership. Their skill was immediately apparent when exhibiting at the 1851 Great Exhibition at Hyde Park, they were the only English instrument makers to receive a prize medal for meteorological instruments, resulting in their appointment as instrument makers to the queen, Greenwich observatory, and the British Meteorological Society. In 1853, when the Crystal Palace was re-erected in Sydenham, Negretti and Zambra became the official photographers of the Crystal Palace Company, which allowed them to photograph the interior and grounds of the new building. The firm made use of this access to produce a number of stereographs. Between 1855 and 1857 Negretti and Zambra commissioned photographer Pierre Rossier to travel to China to document the Second Opium War. Although Rossier subsequently was unable to accompany to Anglo-French forces in that campaign, he nevertheless produced a number of stereographs and other photographs of China, Japan, the Philippines and Siam (now Thailand), which Negretti and Zambra published and that represented the first commercial photographs of those countries. In 1856 Negretti and Zambra sponsored a photographic expedition to Egypt, Nubia and Ethiopia conducted by Francis Firth. In 1864 Negretti and Zambra (themselves) photographed Shakespeare's House at Stratford on Avon. A sepia photograph was then pasted onto card 4" × 2.5". This was then presented to visitors to the Crystal Palace to enable them to compare it with the model erected by Mr E. T. Parr in the Centre Transept. The card itself is headed "Crystal Palace April 23rd 1864." That year they also published a book, titled A Treatise on Meteorological Instruments, (which was reprinted in 1995). Throughout World War One Negretti and Zambra were entirely engaged in the production of various instruments for the Ministry of Munitions. They developed many instruments for the Air Ministry including a mercury-in-steel distance thermometer for taking the oil and air temperatures in aircraft which was patented in 1920. In 1946 the company went private and in 1948 the company was made public, and by 1950 Negretti and Zambra had 821 employees in Britain. In order to increase production and to safeguard future development in 1964, they purchased a modern factory at Aylesbury for all their production. In 1981 Negretti and Zambra were taken over by a group of financial institutions in the form of Western Scientific Instruments and in 1985 the company was acquired by Meggitt Holdings.The subject compass is just one type of the many marine and scientific, optical items this company produced over it’s life time. Negretti and Zambra were prolific manufactures of types of items as well as being very prominent in photography pioneering new innervation's and sponsoring expeditions to little known countries to document peoples daily lives and culture through photography.Azimuth compass on tripod in a fitted wooden box with a round spirit level included, lid of box has three indented circles where the legs of the compass fit when it is set up for use. Stamped "C.M.O. 9" on with Maker Negretti & Zambra London.flagstaff hill, warrnambool, flagstaff-hill, flagstaff-hill-maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, azimuth compass, nautical instrument, negretti & zambra london, navigational instrument, compass

John Bliss (1795-1857) was born in Connecticut, trained as a silversmith and clock maker in Vermont, and began in business as a jeweller in New York around 1830. In 1834, now trading as Bliss & Creighton, he made and marketed chronometers and other items for navigational use. The firm became John Bliss & Son in 1855 and John Bliss & Co. in 1857. It remained in business until 1957. Truman Hotchkiss, a sea captain from Stratford, Connecticut, designed a mechanical Taff rail log in which the recording mechanism was placed on taffrail (or upper part of the stern) of the ship. After acquiring the rights to Hotchkiss’s patents of 1864 and 1867, John Bliss & Co. began advertising the "American Patent Taffrail Log." The firm also offered mechanical logs based on patents granted to John Bliss, Jnr and his brother George, as well as English instruments based on Massey’s and Walker’s patents.The SPECULANT is historically significant as the largest ship to have been registered in Warrnambool, and is believed to have been the largest barquentine to visit Melbourne. It is evidence of the final days of large commercial sailing vessels involved in the Victorian and New Zealand timber trade. The SPECULANT is listed on the Victorian Heritage Register VHR S626John Bliss Taffrail ship log incomplete, rope and spinner missing used on the vessel "Speculant " ( See "Notes" at the end of this document for further information) "Taffrail Log Patented Nov .. Apr .. June .. Sep 1.", dial registers 1/4, units and 10's. with 3 sets of dials, 2 with hands missingflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, la bella, speculant, cumming and ellis, international timber trade, p. j. mcgennan and co. warrnambool, capt. james jacobsen, first mate: james munro, second mate: john scerling;, cook: b bond; a. b., s: v. sundring, s: h. hansen, s: b. melson, s: h. johnston, s: t. trumblen;, ordinary seaman: r. thompson, cape patton, c. ramsden, log, taffrail ship's log, ship log, john bliss, patent log, peter mcgennan

This representative example demonstrates a mariner’s astrolabe. Historical examples are rare. There are less than one hundred known to exist and most of these have been recovered from shipwrecks, many from Spanish and Portuguese vessels. An astrolabe is a measuring device once used to navigate the seas by observing the sun and stars to measure their altitude. The measurement of altitude could then be used to calculate the ship’s latitude but at that time in history there was no means of measuring longitude. The body of the navigational astrolabe was cast brass and much heavier, and less complicated than the variety used on land. The heavier weight and cut-away shape reduced the effect of the wind and waves when trying to use it at sea. A mariner’s astrolabe or ‘star finder’ is a simplified version than that used by Arabic astronomers to find the altitude of the sun and stars above the horizon, and time of the sunrise and sunset. It is a forerunner to the quadrant, octant and sextant and was popular for about 200 years over the 1500s and 1600s to find the latitude of a ship at sea. The user held the astrolabe at eye level and, usually with assistance, aligned the stars through the two small sights (pinnules), then read the altitude indicated by the pointer on the arm. It could also be used to sight the sun by holding it lower down, aiming it at the sun, and adjusting it until the sun shone through both pinnules. This astrolabe is an example used to demonstrate the mariner’s astrolabe, which was navigational tool of the 1500s and 1600s, in the time before longitude was able to be determined. It is a forerunner to modern navigation technology. Mariner’s astrolabe – a representative example. A gold painted, disc shaped object with cut outs and revolving arm in centre. The arm has two sights attached at right angles. The top has a ring attached. Measurements are marked in degrees in a circular scale around outer edge.flagstaff hill, warrnambool, maritime village, maritime museum, flagstaff hill maritime museum & village, shipwreck coast, great ocean road, navigation instrument, navigation tool, navigation, astrolabe, mariner’s astrolabe, measure latitude, measure altitude, arabic navigation, measuring device, star finder, astronomy, marine tool, marine instrument

Kelvin Company History: The origins of the company lie in the highly successful, if strictly informal, the relationship between William Thomson (1824-1907), Professor of Natural Philosophy at Glasgow University from 1846-1899 and James White, a Glasgow optical maker. James White (1824-1884) founded the firm of James White, who was an optical instrument maker in Glasgow in 1850. He was involved in supplying and mending apparatus for Thomson's university laboratory and working with him on experimental constructions. White was actually declared bankrupt in August 1861 and released several months later. In 1870, White was largely responsible for equipping William Thomson's laboratory in the new University premises at Gilmore hill. From 1876, he was producing accurate compasses for metal ships to Thomson's design during this period and this became an important part of his business in the last years of his life. He was also involved in the production of sophisticated sounding machinery that Thomson had designed to address problems encountered laying cables at sea, helping to make possible the first transatlantic cable connection. At the same time, he continued to make a whole range of more conventional instruments such as telescopes, microscopes and surveying equipment. White's association with Thomson continued until he died. After his death, his business continued under the same name, being administered by Matthew Edwards (until 1891 when he left to set up his own company). Thomson, who became Sir William Thomson and then Baron Kelvin of Largs in 1892, continued to maintain his interest in the business after James White's death in 1884, raising most of the capital needed to construct and equip new workshops in Cambridge Street, Glasgow. At these premises, the company continued to make the compass Thomson had designed during the 1870s and to supply it in some quantity, especially to the Admiralty. At the same time, the firm became increasingly involved in the design, production and sale of electrical apparatus. In 1899, Lord Kelvin resigned from his University chair and became, in 1900, a director in the newly formed limited liability company Kelvin & James White Ltd which had acquired the business of James White. At the same time Kelvin's nephew, James Thomson Bottomley (1845-1926), joined the firm. In 1904, a London branch office was opened which by 1915 had become known as Kelvin, White & Hutton Ltd . Kelvin & James White Ltd underwent a further change of name in 1913, becoming Kelvin Bottomley & Baird Ltd . Hughes Company History: Henry Hughes & Sons was founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as Henry Hughes & Sons Ltd in 1903. In 1923, the company produced its first recording echo sounder and in 1935, a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing Marine Instruments Ltd. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd., Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military use. This model compass is a good example of the commercial type of instruments made by Kelvin & Hughes after the world war 2, it was made in numbers for use on various types of shipping after the second world war and is not particularly rare or significant for it's type. Also it was made no earlier than 1947 as the firms of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd who took over from Smith & Sons were not amalgamated until 1947. Given that Smith and Sons is engraved on the compass with Kelvin & Hughes it can be assumed that this compass was made during the company's transitional period to Kelvin & Hughes.Compass, marine or ship's card compass, gimble mounted, with inscriptions. Type is Lord Kelvin 10 inch compass card. Made in Great Britain by Kelvin Hughes Division of S. Smith & Sons (England) Ltd. "LORD KELVIN 10.", "COMPASS GRID", "MANUFACTURED IN GREAT BRITAIN BY", "KELVIN HUGHES DIVISION", "S. Smith & Sons (England) Ltd".flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, marine compass, gimble compass, ship's compass, lord kelvin compass, smith and sons england ltd, henry hughes & son ltd london england, kelvin bottomley & baird ltd glasgow scotland, kelvin & hughes ltd, navigation instrument, scientific instrument, william thomson, james white, baron kelvin of largs

First State Watch Factory: This factory was founded in 1930 under orders from Joseph Stalin, the "First State Watch Factory" was the first large-scale Soviet watch and mechanical movement manufacturer in the USSR. Via its USA-based trading company (Amtorg), the Soviet government bought the defunct Ansonia Clock Company of Brooklyn, New York in 1929, and the "Dueber-Hampden Watch Company of Canton", based in Ohio. The soviets moved twenty-eight freight cars full of machinery and parts from the USA to Moscow in order to establish the factory. Twenty-one former "Dueber-Hampden" watchmakers, engravers and various other technicians helped to train the Russian workers in the art of watchmaking as part of the Soviet's first five-year plan. The movements of very-early products were still stamped "Dueber-Hampden, Canton, Ohio, USA" (examples of these watches are very collectible today). In 1935 the factory was named after the murdered Soviet official Sergei Kirov. During the second world war, as the Germans closed in on Moscow in 1941, the factory was hurriedly evacuated to (Zlatoust USSR). By 1943 the Germans were in retreat, and the factory was moved back to Moscow, adopting the "First Moscow Watch Factory" name. In 1947 the first wristwatches under the brand name "Pobeda" and the first Marine Chronometers and Deck watches were produced. By 1951 the production of wristwatches had increased to 1.1 million. In 1975 new machinery and equipment for manufacturing complex watches were imported from Switzerland. The first chronograph called "Okean" (3133) was produced for the space station "Soyuz-23."The Chronometer is of recent manufacture and an excellent example of the type of instrument used to navigate the seas in the 19th century. It is of good quality and of a type regarded as very accurate and well made. The maker, First Watch Factory, has a dept that is still producing the "8916" standard Chronometer for horologists and collectors. Marine chronometer of Russian make in wooden case, metal handles on sides, inscription on a metal plaque on the front of the case. Polished square wooden outer case with green felt lining and, a leather carrying strap and buckle. Outer case is hinged and has a metal latch on the front. Outer case has a red velvet covering with a button and loop closure. Inscription on box are in Russian & translate as follows: ХРОНОМЕТР, = CHRONOMETER МОРСКОЙ, = NAUTICAL ГОСТ, 8916-77 = Gost ЛОЛ ЕТ, on dial face = LOL ETflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, chonometer, russian, watch factory, marine, navigational instrument

A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions, or "points".

This is the Bridge Section of a ship’s telegraph and is a Duplex Gong model, made by Chadburn & Son of Liverpool. This duplex gong model would sound two signals whenever the navigational commands were given by the ship’s pilot to change the speed or direction. The ship’s telegraph was installed on Flagstaff Hill’s exhibit of the 1909 Hobart, Tasmania, ferry “SS Rowitta” installed in 1975 and enjoyed for more than 40 years. Communication between the ship’s pilot and the engine room in the late 19th century to the mid-20th-century was made with a system called an Engine Order Telegraph (E.O.T.) or ship’s telegraph. The equipment has two parts, the Bridge Section and the Engine Room Section. The Bridge Section is usually mounted onto a pedestal, and the Engine Room Section is attached to a vertical surface. The standard marine commands are printed or stamped around the face of the dial and indicated by a pointer or arrow that is usually moved by a rotating brass section or handle. The ship’s pilot stationed on the Bridge of a vessel sends his Orders for speed and direction to the Engine Room with the E.O.T. He moves the lever or levers, depending on the number of engines the ship has, to change the indicator on the Bridge Section’s dial to point in the new direction and speed of travel. This change causes the Orders to be duplicated on the Engine Room Section’s dial and a bell or bells to signal the change at the same time. The engineer then adjusts the ship’s engines and steering equipment to follow the pilot’s Order. CHADBURN & SON, Liverpool- Chadburn Brothers, William and C.H., were joint inventors and well-established makers of optical and scientific instruments and marine gauges. The firm was granted the Prince Albert Royal Warrant in the late 19th century. In 1870 William Chadburn applied for a patent for his navigational communication device for use on ships. By 1875 Chadburn & Son was producing the brass Engine Order Telegraph in its plant at 71 Lord Street, Liverpool. In 1911 the ship RMS Titanic was launched, fitted with Chadburn & Sons E.O.T. The Chadburn Ship Telegraph Company Limited was registered in 1898 to take over Chadburn & Sons. In 1903 a large factory at Bootle, near Liverpool, and their products were being sold overseas. In 1920 electric-powered telegraphs were developed. In 1944 the name changed to Chadburn’s (Liverpool) Limited. In 1968 the company became Chadburn Bloctube Ltd. In 2000 the company, now Bloctube Marine Limited, was still manufacturing ship telegraphs. SS ROWITTA: - The 1909 steam ferry, SS Rowitta, was installed as an exhibit at Flagstaff Hill in 1975 and was enjoyed by many visitors for 40 years. Rowitta was a timber steam ferry built in Hobart in 1909 using planks of Huon and Karri wood. It was a favourite of sightseeing passengers along Tasmania’s Tamar and Derwent rivers for 30 years. Rowitta was also known as Tarkarri and Sorrento and had worked as a coastal trading vessel between Devonport and Melbourne, and Melbourne Queenscliff and Sorrento. In 1974 Rowitta was purchased by Flagstaff Hilt to convert into a representation of the Speculant, a historic and locally significant sailing ship listed on the Victorian Heritage Database. (The Speculant was built in Scotland in 1895 and traded timber between the United Kingdom and Russia. Warrnambool’s P J McGennan & Co. then bought the vessel to trade pine timber from New Zealand to Victorian ports and cargo to Melbourne. It was the largest ship registered with Warrnambool as her home port, playing a key role in the early 1900s in the Port of Warrnambool. In 1911, on her way to Melbourne, it was wrecked near Cape Otway. None of the nine crew lost their lives.) The promised funds for converting Rowitta into the Speculant were no longer available, so it was restored back to its original configuration. The vessel represented the importance of coastal traders to transport, trade and communication in Australia times before rail and motor vehicles. Sadly, in 2015 the time had come to demolish the Rowitta due to her excessive deterioration and the high cost of ongoing repairs. The vessel had given over 100 years of service and pleasure to those who knew her. This Bridge section of a ship’s Engine Order Telegraph, used with an Engine Room section, represents late-19th century change and progress in communication and navigation at sea. This type of equipment was still in use in the mid-20th century. The object is significant for its association with its maker, Chadburn & Son, of Liverpool, a well-known marine instrument maker whose work was recognised by English Royalty, and whose products were selected to supply similar equipment for use on the RMS Titanic. This ship’s telegraph is connected to the history of the Rowitta, which was a large exhibit on display at Flagstaff Hill Maritime Village from the museum’s early beginnings until the vessel’s end of life 40 years later. The display was used as an aid to maritime education. The Rowitta represents the importance of coastal traders to transport, trade and communication along the coast of Victoria, between states, and in Australia before rail and motor vehicles. The vessel was an example of a ferry built in the early 20th century that served many different roles over its lifetime of over 100 years. Bridge section of a Ship’s Telegraph or Engine Order Telegraph (E.O.T.). The round double-sided, painted glass dial is contained within a brass case behind glass. It is fitted onto an outward tapering brass pedestal with a round base. The brass indicator arrows between the handles point simultaneously to both sides of the dial when moved. An oval brass maker’s plate is attached to the top of the case. The dial’s faces have inscriptions that indicate speed and direction, and the front face and plate include the maker’s details. A serial number is stamped on the collar where the dial is fitted to the pedestal. The ship’s telegraph is a Duplex Gong model, made by Chadburn & Son of Liverpool. Dial, maker’s details: “PATENT “DUPLEX GONG” TELEGRAPH / CHADBURN & SON / TELEGRAPH WORKS / PATENTEES & MANUFACTURERS / 11 WATERLOO ROAD / LIVERPOOL” LONDON / 105 FENCHURCH STREET” “NEWCASTLE / 85 QUAY + SIDE” “GLASGOW / 69 ANDERSON QUAY” “PATENT” Dial instructions: “FULL / HALF/ SLOW / FINISHED WITH ENGINES / STOP STAND BY / SLOW / HALF / FULL / ASTERN / AHEAD” Maker’s plate: “CHADBURN / & SON / PATENT / LIVERPOOL” Serial number: “22073”flagstaff hill, warrnambool, maritime village, maritime museum, shipwreck coast, great ocean road, engine order telegraph, e.o.t., navigational instrument, communication device, ship’s telegraph, engine room section, bridge section, rms titanic, chadburn & son, chadburn brothers, william chadburn, chadburn ship telegraph company, chadburns, duplex gong, liverpool, ss rowitta, navigation, marine technology, pilot’s orders, steam power, hobart, tasmania, devonport, tasmanian-built, ferry, steam ferry, steamer, 1909, early 20th century vessel, passenger vessel, tamar trading company, launceston, george town, sorrento, tarkarri, speculant, peter mcgennan, p j mcgennan & co. port phillip ferries pty ltd, melbourne, coastal trader, timber steamer, huon, karri, freighter, supply ship, charter ferry, floating restaurant, prawn boat, lakes entrance

Alien Tax Receipt, dated 30/3/37. Matson Navigation Co.-The Oceanic Steamship Co. Received from Mr. R. H. S. Abbott.sciences, instruments - general, scalebuoy, bill ashman collection - correspondence, alien tax receipt, matson navigation co, the oceanic steamship co, r h s abbott, clayden

Newspaper article titled 'Radio in the New World' by R. K. Gerrand from the Melbourne, The Herald. Piece has been torn from the paper and the only date is Saturday, Dec. Sub-heading is: What developments can we expect in radio after the war? Items covered are: X-rays, Outback radio telephones, travel telephones, Portable trans-ceivers, Automatic weather reporting stations, Frequency modulations, Television, Electronic microscope, radio location, Battle of Britain, Battle of Australia, navigation and Pasteurisation,sciences, instruments - general, scalebuoy, bill ashman collection - correspondence, the herald melbourne, r k gerrand, radio in the new world, f w clarke, electronic industries ltd, radio corporation, x-rays, outback radio telephones, travel telephones, portable trans-ceivers, automatic weather reporting statins, frequency modulations, television, electronic microscope, radio location, battle of britain, battle of australia, navigation, pasteurisation

The sculptural installation was a gift from the Portuguese government and presented to Warrnambool City Council. The sculptor, Jose Nuncio, completed the work in 1999, and it was inaugurated at Warrnambool in 2001. Prince Henry the Navigator founded a school of navigation in Sagres, Portugal. This led to navigation techniques that made the 15th century voyages of discovery possible. The vision of Prince Henry brought together ship builders, cartographers, instrument makers and mathematicians. Vasco de Gama rounded the southern tip of Africa and sailed across the Indian Ocean to India in 1496. This started a new era of trade and exploration, expanding the boundaries of the known world, and linking the east with west.Six colour photographs of a sculptural installation at Warrnambool. Busts of Vasco De Gama and Prince Henry the Navigator feature in the installation. Images also include two informative plaques containing information on De Gama and the Prince.warrnambool, exploration, navigator, de gama, prince henry the navigator, portugal, portuguese, david atkinson, john pandazopoulos

The navigational computer was a circular slide rule used for calculating height and air speed corrections when flying an aircraft. The front cover lifts to reveal a further calculator used to solve vector triangles and plot course alterations. The device was intended to be strapped to a pilot's leg. The instrument was made by White and Gillespie (Melbourne) Pty Ltd c 1940 for the RAAF and used during WW2.Black metal box with silver metal flap top cover affixed with rotating circular rule . Two adjustable belts are affixed to the base of black box. A small spiral bound note book is contained beneath the flap top. RAAF Computer Navigational system MK. III. D. Serial No WG 2833navigation, raaf, computer, aircraft, ww2, 1940

The Mark II Pilot Balloon Slide Rule was made of wood laminated with heavy white plastic with a length of 24.5-in. and width of 2.5 inches. Mark II rules were manufactured in Australia by W & G (Melbourne). The W & G rule differs only slightly from the English A. G. Thornton LTD rule. The W & G rule uses serif fonts and has some fiducial marks that the English rule lacks. Exact dates of production are not known but the MK II is known to have started production by 1927. The printed scales are engraved in the plastic faces. The slide rule has 4 captive cursors (glass windows and brass guides) that ride in slots on the top and bottom edges. Each can be moved independently of one another. The cursors are missing from this item. Brass knobs at both ends of the slide facilitate its movement. The case is fabric covered wood with felt lining. No known history for this item as located in a property after purchase. The Pilot Balloon slide rule is used to convert the observed azimuth and elevation readings into wind velocity and direction records. The use of slide rules was abandoned with the wide spread adoption of computers and programs to do the calculations, as well as the decline in the use of optical pilot balloon theodolites.Made in Australia by White & Gillespie (Melb) Pty Ltd. Established in 1910, the firm was involved mainly in printing plate manufacture, but during the Second World War it manufactured a variety of navigational aids and range finding devices for the military. About 250,000 instruments were made during that period. After the war the company produced, among other items, drawing instruments and slide rules. The case is fabric covered wood with felt fabric lining containing a long black laminate ruler with numerous white markings and numbers. Top of the ruler is in three sections with the centre section movable by small gold metal knobs at either end. This slide rule contains a engraved notation on the rear face "IMPORTANT. NORMALLY NUMBER OF GRATICULE SCALE DIVISIONS PER RADIAN (K) X LENGTH OF TAIL IN FEET (I) = 12X 105. IN OTHER CASES MULTIPLY GRATICULE READINGS BY 1.2/KI BEFORE CALCULATION ON RULE" Top of Slide Rule - RAAF Ident No G268/480 Serial WG/22pilot balloon slide rule, raaf