The theodolite is used in surveying and measures vertical and horizontal angles. Placed on a tripod, it is used to find angles in road building, tunnel alignment and other civil-engineering work. The theodolite was used at Ballarat School of Mines in the surveying course. It is possible that this instrument was imported by Flavelle Bros & Co having been made to their order by a European instrument makerTheodolite (without a matching tripod) with four leveling screws at the base. Telescope not fully rotatable, ends can be interchanged. Underslung levelling bubbletheodolite, surveying, european instrument, importers, ballarat school of mines, flavelle bros & co, measuring angles, road building, civil engineering

An inclinometer measures the angle of inclination of a vessel or aircraft to the horizontalTimber and brass inclinometer from the M.V. Australian Explorer. Triangular timber shape with curved base. Brass measuring plate with measurements from 0-40 degrees on each side. Brass pointer indicates angle of inclination of vessel. 'EIWA' label on front. '87-156' inscribed in pen on back and underside. navigational instruments, australian explorer

An Octant is a doubly reflecting navigation instrument used primarily by sailors to measure the angular distance between two visible objects and was a forerunner of the sextant. The name comes from the Latin octo, or "one-eighth of a circle," for the Octan'ts arc which spans 45°, or one-eighth of a circle. The primary use of an Octant is to measure the angle between an astronomical object and the horizon for celestial navigation. The estimation of this angle, is known as sighting or shooting the object, or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical chart (latitude), for example, sighting the Sun at noon or Polaris at night (in the Northern Hemisphere) gives an angle by which the latitude can then be estimated. Sighting the height of a landmark on land can also give a measure of distance. This fine octant once belonged to Captain Farquhar Chisholm and was donated by his granddaughter, Margaret Ruth Greer (nee Chisholm, born 1914). The label inside the Octant's box reads “Thomas L. Ainsley, Instrument Maker … etc”. Farquhar Chisholm was born in 1832 in Inverness, Scotland. He regularly sailed on perilous voyages between Quebec, Canada and the Baltic ports of Europe. In 1854 he migrated to Australia during the Gold Rush, to a place called Fiery Creek (near Beaufort Victoria) where he was fairly successful in his quest for gold. In the years of the Great Gold Rush, it was said that there were over 40,000 diggers in the goldfields of the Beaufort area! In 1857 having made sufficient money, he hired another crew and returned to Clachnacuddin, Inverness shire, Scotland and in that same year, he studied and obtained his Master Mariner Certificate (which would have included the use of an octant for navigation). He was appointed to Mr George (or James) Walker, as commander of his sailing ship, the 3-masted ELIZABETH, built 1859 and known as “The Walker barque”. In 1870 he married, then in 1887 returned to Australia with his wife and children (Kenneth Chisholm (1871), Mary Bremner Chisholm (1873), Margaret Hood Chisholm (1874), Farquhar Chisholm (1878)). They arrived in Port Melbourne, Victoria and sadly, only six weeks after landing, his wife Caroline passed away (in Geelong,1888). In 1900 Capt. Chisholm lived in Camperdown (Victoria) and not long after this his daughter Margaret died of consumption. In his later years, he went to live in the manse of St. Paul’s Presbyterian Church, Wangaratta, with his son, Rev. Farquhar Chisholm. He died there on Sat, 23rd March 1912, 80 years old. He was known as “… quiet, unobtrusive and competent, respected by all with whom he came in contact”. Some other members of Captain Chisholm’s family are; his older son Kenneth Chisholm, who was a contractor in Camperdown; a nephew Donald Macintosh (of 23 Douglas Row, Inverness); a grandson Brian Jones (son of Caroline Belle-Jones nee Chisholm, who lived in Camperdown in the earlier part of her life).The octant, the forerunner of the sextant, was a significant step in providing accuracy of a sailors latitude position at sea & his vessels distance from land when taking sightings of land-based landmarks.Octant, once belonging to Captain Farquhar Chisholm. Wedge shape (the size of an eighth of a circle), made of wood, glass and metal. Used in the 1880s. Maker’s name across centre “L. SIMON - - - SHIELDS”. Three (3) light filtering, coloured glass shades. Two (2) eyepieces. Scale attached for measuring angles. Label inside the fitted, wedge-shaped case "Thomas L. Ainsley, Optician"Label inside case "Thomas L. Ainsley, Optician" Maker’s name across centre “L. SIMON - - - SHIELDS”.flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, maritime navigation, navigation instrument, migration, captain chisholm, farquhar chisholm, sailing ship, the elizabeths, thomas l. ainsley, l. simons, shields england, octant, john hadley, chisholm

This clinometer, is a hand-held optical scientific instrument used in surveying to measure vertical angles. It is used to measure the angle of elevation from the ground in a right-angled triangle. It may have been used by a surveyor or a forester to measure the height of tall things where you couldn't possibly reach to the top of e.g. flag poles, buildings or trees.This item is an example of an early hand held measuring instrument.. Today the use of electronic sensors is an important component in the design and function of the clinometers.A rectangular wooden folding measuring instrument. the panels are brass framed. Inside is a brass semi-protractorgraduated 90-0-90' with index arm pointeran dwith a graduated edge in inches. Outside is a temperature conversion scale,Troughton & Simms, LONDONscientific-instrument measurement clinometer

Theodolites have been used to measure horizontal and vertical angles by surveyors since the 1500s. A theodolite is a precision instrument for measuring angles in the horizontal and vertical planes. Theodolites are used mainly for surveying applications, and have been adapted for specialized purposes in fields like meteorology and rocket launch technology. Theodolites, such as this one, were instrumental to early surveyors, and would have played a significant part in their everyday work. The plumb bob was used to set the instrument exactly over a fixed survey marker.This theodolite was made by Troughton and Simms, who were significant scientific instrument makers of the 19th century and early 20th century. In 1782 John Troughton purchased Benjamin Cole's shop in Fleet Street, London enabling him to sell his own signed products. His instrument making business supported several dynasties of Troughtons before becoming Troughton and Simms and later still Cooke Troughton & Simms. This firm was one of the most well respected firms of instrument makers of the 1800s. A grey metal theodolite - probably made of brass. It has movable parts and there is a weight ( a plumb bob) attached with string.Cooke Troughton & Simms Yorke England V012318 Supplied by A. E. Parsons Melbournetheodolite scientific-instruments surveying

Surveying instrument for measuring horizontal and vertical anglesmetal instrument in boxsurveying equipment

This instrument is a folding arm protractor. It is used for measuring angles on the vertical and horizontal planes. The two folding arms have small metal support springs where they are attached to provide support and the other ends have pins with which to mark particular points. A screw mechanism on the rim allows fine tuning of plotting. Chadburn, Brothers were fine instrument makers of Sheffield making optical and nautical instruments during the 19th century. This item was donated by a local resident whose grandfather Carl Spence was a bridge builder who worked on the Warrnambool Breakwater extension c 1919. This item has scientific significance which is possibly linked via the owner to one of Warrnambool's most well known landmarks.Brass, circular instrument with fold out sections which are hinged and a movable section. The circular part is marked in degrees around the circle. Notches on inner rim at 90 degrees intervals. Chadburn ,Brothers Sheffield. Graduated scale measuring 360 degrees.warrnambool, warrnambool breakwater

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

Theodolites are a highly accurate instrument that measures angles between designated visible points in the horizontal and vertical planes. The theodolite has a long history, with the term first found in 1571 in a surveying textbook 'A geometric practice named Pantometria' by Leonard Digges. (source https://en.wikipedia.org/wiki/Theodolite). Theodolites are used by surveyors as part of their everyday work and although there is no specific information regarding the provenance of this particular one it is assumed it was used locally by the Shire of Marong and / or the Lands Department. Edwin Watts started the company in 1856, trading up to 1920s as E.R. Watts & Son with E. R. Watts & Son Ltd amalgamating with Adam Hilger Ltd to form Hilger & Watts in 1948.0442.1 A black and grey theodolite no 39161 made by Watts & Sons. Various moving parts showing signs of extensive use particularly on the uprights on the main body and around knobs and dials where the paint is worn back to brass. Is housed in original box with key, oil container and pin. 0442.2 handwritten instructions for making adjustments to the Theodolite written on the back of Road Users' Association of Victoria letterhead note paper.Watts & Sons / London / 5974 For N H Seward / Melbournelands and survey department bendigo, shire of marong

In 1941, 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. Kelvin Company History: The origins of the company lie in the highly successful and strictly informal 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, an optical instrument maker in Glasgow in 1850 and was involved in supplying and mending apparatus for Thomson university laboratory and working with him on experimental constructions. White was declared bankrupt in August 1861 and released several months later. In 1870, White was largely responsible for equipping William Thomson laboratory in the new University premises at Gilmore hill. From 1876, he was producing accurate compasses for metal ships to Thomson 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 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. G. Falconer Company History: G Falconer (Hong Kong Ltd) appear to have had a retail presence in Hong Kong since 1885, according to the company website, and currently have a shop in the Peninsula Hotel. G Falconer was the Hong Kong selling agent for several British companies. Ross Ltd of 111 New Bond St London was one and the other was Kelvins Nautical Instruments. Falconers were primarily watchmakers, jewellers and diamond merchants.They were also agents for Admiralty Charts, Ross binoculars and telescopes, and sold English Silverware and High Class English Jewellery. In 1928 the company was operating from the Union Building opposite the Hong Kong general post office. It is unclear if the item is an original Sextant made by Kelvin prior to his amalgamation with Henry Hughes & Sons in 1941 as Kelvin appears to have only made compasses up to this date. If the Sextant can be established that it was made by Kelvin then it is very significant and a rare item made for and distributed through their Hong Kong selling agents G Falconer Ltd. There are many Sextants advertised for sale stating "Kelvin & Hughes 1917 model sextant". These can be regarded as replicas as the company was not formed until 1941 and production of marine instruments was not fully under way until after the war in 1947. Further investigation needs to be undertaken to accurately determine the provenance of this item. As the writer currently has the impression that the subject object was possibly made by Kelvin and Hughes in the mid to late 20th century or is a replica made by an unknown maker in the late 1970s. Purchased as an exhibition of marine navigational instruments for the Flagstaff Hill museum. The Sextant is a brass apparatus with filters and telescope lens, and comes with a wooden felt lined storage box. It is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation.G Falconer and Co. Hong Kong (retailers of nautical equipmentflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, sextant, kelvin & hughes ltd, hong kong, navigational instrument, g falconer, mariner's quadrants

A sextant is an astronomical instrument used to determine latitude and longitude at sea by measuring angular distances, especially the altitudes of the sun, moon, and stars. It is a doubly reflecting navigation instrument and used mainly by sailors to measure the angular distance between two visible objects. The name comes from the Latin sextans, or “sixth part of a unit,” because the sextant’s arc can be 60° or 120° of a circle depending on the model used. The primary use was to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. The estimation of this angle is known as sighting or shooting the object, or taking a sight. This angle and the time when it was measured is used in order to determine Greenwich Mean Time and hence longitude. Sighting the height of a landmark on land can also give a measure of distance from that object. History: The development of the sextant was as an improvement over the octant, an instrument designed to measure one's latitude. The octant was first implemented around 1731-present but can only measure angles up to 45°. As larger angles were needed to allow the measurement of lunar objects - moon, stars and the sun - at higher angles, the octant was superseded by the sextant. The sextant is a similar instrument but better made and allows larger angles from 60° to 120°. This improvement allows distances to be accurately calculated thereby giving longitude when used with a chronometer. The sextant was derived from the octant in 1757, eventually making all previous instruments used for navigational positioning obsolete. The sextant had been attributed to by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but reference to the sextant was also found later in the unpublished writings of Isaac Newton (1643–1727). Earlier links can be found to Bartholomew Gosnold (1571–1607) indicating that the use of a sextant for nautical navigation predates Hadley's implementation. In 1922, the sextant was modified for aeronautical navigation by Portuguese navigator and naval officer Gago Coutinho. It should be noted that the octant and quadrant are in the same family as they were, and all are, regarded as sextants. The sextant is representative of it's type and although not fully complete it demonstrates how 18th,19th and 20th century mariners determined their latitude and longitudinal to determine their position on a chart, allowing them to navigate there way across the world's oceans. It also demonstrates the skill and workmanship of the early instrument makers that operated scientific instrument businesses from London and other areas of England to provide most of the navigational instrumentation used by commercial and military navies of the time.Sextant with square, fitted box of polished wood, "Hezzanith" brand. Box contains many parts for the sextants use. On certificate "Heath & Co, London. Sextant Number Y 822". Catch on lid "DEFIANT LEVER" and "PATENT NUMBER 187.10". Maker's certificate is attached to the inside of the box.flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, sextant box, sextant, hezzanith, heath & co, navigational instrument, george wilson heath, astronomical instrument, instrument manufacturers, scientific instrument, navigation, celestial navigation, octant, quadrant, lunar navigation

Theodolites are a highly accurate instrument that measures angles between designated visible points in the horizontal and vertical planes. The theodolite has a long history, with the term first found in 1571 in a surveying textbook 'A geometric practice named Pantometria' by Leonard Digges. (source https://en.wikipedia.org/wiki/Theodolite). Cooke Troughton & Simms began when John Troughton starting selling products in Fleet Street, London in 1782. He went into partnership with his brother Edward in 1807 who expanded the business considerably. William Simms, a former apprentice with the company was taken as a partner and then manager after Edward died in 1835 and the company became Troughton & Simms. By 1887 the company was able to produce all the parts necessary for their instruments and the company employed nearly 200 people and was one of the most well respected firms of instrument makers of the 1800's. James Simms, son of William who had inherited the company died in 1915 and the company was turned into a limited liability company by his two sons William and James. Things however were not so easy for the two sons and in 1922 the business was brought out by their rival T. Cooke & Sons becoming Cooke, Troughton & Simms. Theodolites are used by surveyors as part of their everyday work and although there is no specific information regarding the provenance of this particular one it is assumed it was used locally by the City of Bendigo and / or the Lands Department.A grey theodolite no 39161 made by Cooke, Thoughton & Simms. Various moving parts showing signs of extensive use particularly on the uprights on the main body and around knobs and dials where the paint is worn back to brass.Cooke, Thoughton & Simms Ltd / York. England / No 39161. Sticker; DPS - Asset No / (barcode) / 0010173city of greater bendigo administration item, lands and survey department bendigo

A School of Military Survey Precis, 8 x foolscap sized pages of typed text, stapled and two hole punched. The precis No 3 covers the Observation procedure to be used for 1st, 2nd and 3rd Order Triangulation using the Royal Australian Survey Corps standard Cooke, Troughton and Simms Tavistock or Wild T2. The geodetic model Tavistock with a 5.25" horizontal circle should be used for 1st Order Triangulation and maybe used for 2nd Order Triangulation if specially directed. The standard Tavistock with 3.5" horizontal circle or the Wild T2 should be used for 2nd and 3rd Order observations. The Precis discusses the types of errors, the source of errors and the best ways of managing them. In surveying, triangulation is the process of determining the location of a point by measuring only angles to it from known points at either end of a fixed baseline by using trigonometry, rather than measuring distances to the point directly as in trilateration.A School of Military Survey Precis, 8 x foolscap sized pages of typed text, stapled and two hole punched.royal australian survey corps, rasvy, fortuna, army survey regiment, army svy regt, asr, school of military survey, sms, balcombe

An Octant is a doubly reflecting navigation instrument used primarily by sailors to measure the angular distance between two visible objects and was a forerunner of the sextant. The name comes from the Latin octo, or “one-eighth of a circle,” for the Octant’s arc which spans 45°, or one-eighth of a circle. The primary use of an Octant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. The estimation of this angle is known as sighting or shooting the object, or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical chart (latitude), for example, sighting the Sun at noon or Polaris at night (in the Northern Hemisphere) gives an angle by which the latitude can then be estimated. Sighting the height of a landmark on land can also give a measure of distance. History: The principle of the Octant as an instrument to measure ones latitude was first implemented around 1742-present but was superseded by the improvement of the octant to a sextant, a very similar instrument, better made and able to measure bigger angles 120°, allowing the measurement of Luna distances to give longitude when used with an accurate chronometer. The sextant started to appear around 1730 and had been attributed to by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but reference to the sextant was also found later in the unpublished writings of Isaac Newton (1643–1727). Earlier links can be found to Bartholomew Gosnold (1571–1607) indicating that the use of a Sextant for nautical navigation predates Hadley's implementation. In 1922, the sextant was modified for aeronautical navigation by Portuguese navigator and naval officer Gago Coutinho. Henry Hemsley was a lesser-known instrument maker and optician working in London in the late 17th and early 18th century. However, it should be noted that there were two Henry Hemsley opticians and instrument makers around this period. (Henry Hemsley 1, 1786-89, who had premises at 85 Fleet St London and Henry Hemsley 2, 1828-56), whose workshop was at 135-138 Radcliff Highway London. Therefore, based on the inscribed workshop address Henry Hemsley 2 is responsible for making this example.The octant is representative of its type and although not fully complete it demonstrates how 18th and 19th-century mariners determined their latitude on a chart to navigate their way across the world's oceans in the 18th and 19th century. It also demonstrates the skill and workmanship of the early instrument makers that operated from London at this time and provided most of the navigational instrumentation use by commercial and military navies of the time.Octant, ebony wooden frame and handle. Scale is missing from recess in frame. "H. Hemsley 135-138 Ratliff Highway, London", no box"H. Hemsley 135-138 Ratcliff Highway, London"flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, navigation, navigational instrument, instrument used for navigation, sextant, henry hemsley, instrument maker, london, octant

The double bevel gauge is used as a drawing tool, to measure, set angles and transfer angles. The shipwright’s tools on display in the Great Circle Gallery are connected to the maritime history of Victoria through their past owner, user and donor, Laurie Dilks. Laurie began his career as a shipwright in the mid-1900s, following in the wake of the skilled carpenters who have over many centuries used their craft to build and maintain marine vessels and their fittings. You can see Laurie’s inscription on the tool called a ‘bevel’. Laurie worked for Ports and Harbours, Melbourne, for over 50 years, beginning in the early 1960s. He and a fellow shipwright inscribed their names on a wheelhouse they built in 1965; the inscription was discovered many decades later during a repair of the plumbing. Many decades later Laurie worked on the Yarra moving barges up and down the river and was fondly given the title ‘Riverboat Man’ His interest in maritime history led him to volunteer with the Maritime Trust of Australia’s project to restore and preserve the historic WWII 1942 Corvette, the minesweeper HMAS Castlemaine, which is a sister ship to the HMAS Warrnambool J202. Laurie Dilks donated two handmade displays of some of his tools in the late 1970s to early-1980s. The varnished timber boards displayed the tools below together with brass plaques. During the upgrade of the Great Circle Gallery Laurie’s tools were transferred to the new display you see there today. He also donated tools to Queenscliffe Maritime Museum and Clunes Museum.The shipwright’s tools on display in the Great Circle Gallery are connected to the maritime history of Victoria through their past owner, user and donor, Laurie Dilks. Laurie began his career as a shipwright at Ports and Harbours in Melbourne in the mid-1900s, following in the wake of the skilled carpenters who have over many centuries used their craft to build and maintain marine vessels and their fittings.This double bevel gauge has three lengths of flat brass that swivel at the joints. The long piece has curved ends and indented arcs, one on each side, along the length. The short pieces have diagonal ends. The centre length has a hole through the middle. The short pieces have a screw with its head above the flat brass. The tool has an inscription. It once belonged to shipwright Laurie Dinks.Bevel marked "L DILKS" "G. M."flagstaff hill, warrnambool, great ocean road, shipwreck coast, maritime museum, maritime village, shipwright, carpenter, shipbuilding, ship repairs, hand tool, equipment, ship maintenance, cooper, tool, marine technology, bevel, drawing tool, measuring tool, laurie dilks, l dilks, port and harbours melbourne

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 is a set of 16 photograph of the Royal Australian Survey Corps’ Johnson Ground Elevation Meter (JGEM) Survey Vehicle taken at the Army Survey Regiment, Fortuna, Bendigo. The JGEM vehicle was extensively used by RA Svy within Australia from the late 1960s. A limited number of Ground Elevation Meter (GEM) station wagon type vehicles were manufactured by General Motors Corporation (GMC) in the USA for the United States Geological Survey, Canada’s mapping agencies, RA Svy and National Mapping (Natmap). The GEM was a four-wheel drive, four-wheel steer vehicle. Four-wheel steering was necessary to avoid systematic errors caused by non-tracking of front and rear wheels on conventionally steered vehicles. The manufacturer substituted the rear axle with a front axle and connected them to form the four-wheel steering mechanism. The two Australian GEM vehicles, referred to as Johnson GEMs (JGEMs) were converted into right-hand drive. After delivery in 1964, acceptance Natmap and RA Svy testing and operator training was undertaken at the Army's School of Military Survey located at Balcombe, Victoria. A small fifth wheel was mounted on a cantilever arm suspension midway between the front and rear wheels on the right side of the vehicle. It was lowered to and raised from its operating position by use of a constant pressure air cylinder. A telescopic bar, suspended between the front and rear axles, provided the reference datum for the angle measurement. The wheel provided the velocity or distance signal through a pulse generator system. A sensitive pendulum mounted on this bar provided the angle measurement for each minute distance traversed. The JGEM contained electromechanical instruments used to determine relative elevations, by trigonometric principles, along a traversed path. These relative elevations were obtained through apparatus which measures the instantaneous angle of inclination of the road and the instantaneous velocity of the meter along such a path. Road routes over which the JGEM operated were planned so that each started and ended as near as practicable to an existing point of known elevation (formally referred to as a level traverse bench mark). The difference in height from the bench mark and the road surface alongside the JGEM’s fifth wheel was measured with a level and staff. Along each route, mapping control photo reference points where new elevation values were required were identified on aerial photographs. Under favourable conditions it was possible to survey as much as 160km in an ordinary working day. The first of RA Svy’s JGEM operations was undertaken in 1:250,000 scale map areas of Queensland. CPL John Hook was the JGEM’s main operator in the early 1970s undertaking operations covering 1:250,000 scale map blocks over northern Victoria and central NSW, each requiring 36 points (9 runs of photography and 4 points across. SPR Lyn Thompson and SPR Bob McDonagh teamed with CPL Hook on some of these JGEM operations. When RA Svy was integrated into the Royal Australian Engineers in 1996, the JGEM vehicle with the Survey Corps collection was donated to its museum. It is believed to be the last of the original manufactured fleet in existence. The JGEM has undergone extensive refurbishment to achieve roadworthiness and is currently housed at The Australian Army Museum of Military Engineering, Hoslworthy Barracks, NSW. It can be viewed by making an appointment with the museum’s curator.This is a set of 16 photograph of the Royal Australian Survey Corps’ Johnson Ground Elevation Meter (JGEM) Survey Vehicle taken at the Army Survey Regiment, Fortuna, Bendigo. The photographs were on 35mm slide film and were scanned at 96 dpi. They are part of the Army Survey Regiment’s Collection. .1) - Photo, colour, c1960s, Johnson Ground Elevation Meter (JGEM) Survey Vehicle .2) - Photo, colour, c1960s, JGEM instrumentation, on-board computer. .3) - Photo, colour, c1960s, JGEM instrumentation. .4) - Photo, colour, c1960s, JGEM instrumentation, on-board computer. .5) - Photo, colour, c1960s, JGEM tyre pressure controller .6) - Photo, colour, c1960s, JGEM rear doors, SGT Geoff Briggs. .7) - Photo, colour, c1960s, JGEM 5th wheel distance/angle measurement device in lowered position, SGT Geoff Briggs. .8) - Photo, colour, c1960s, JGEM 5th wheel distance/angle measurement device in lowered position. .9) & .10) - Photo, colour, c1960s, JGEM tyre pressure system, SGT Geoff Briggs. .11) - Photo, colour, c1960s, JGEM tyre pressure system. SGT Geoff Briggs. .12) - Photo, colour, c1960s, JGEM levelling scope, levelling staff, unidentified technicians. .13) & .14) - Photo, colour, c1960s, JGEM levelling scope, unidentified technician. .15) & .16) - Photo, colour, c1960s, probably survey operation adjusted height plotted on block base sheet. .1P to .16P - Some of the equipment is annotated on the frame of the 35mm slides.royal australian survey corps, rasvy, army survey regiment, army svy regt, fortuna, asr, surveying

This walking stick, which is also a horse measurer, belonged to Atwell George Bendall, the well-known racing man, judge and handicapper in the Western District early in the 20th century. Born in the Caramut district, he was the manager of the ‘Green Hills’ estate at Winslow, a property owned by his father who also operated a livery and coach service at Caramut. When his father died Bendall carried on the family business until the end of the 19th century when he went to live in Warrnambool. A lover of horses, Bendall was an amateur rider of note and an owner of several racehorses. He also took a keen interest in coursing and owned and bred many successful dogs. In Warrnambool he took an interest in trotting and owned several trotters. For the last sixteen years of his life Atwell Bendall was a handicapper for most of the Western District race clubs and his keen judgment and knowledge of horses were greatly admired and appreciated. He was also a judge at agricultural shows and other horse events and this is probably where he was made use of this horse-measuring walking stick. He died in 1922. This is a most significant item as it belonged to the prominent early 20th century horse racing identity in the Western District – Atwell Bendall. It is also of general historical interest as an ingenious object – a walking stick doubling as a horse measurer. This is a mottled brown-coloured wooden walking stick, slightly tapered and with seven segments. It has a wooden knob at the top curved and indented in an acorn shape. The knob has silver coloured nails or tacks driven into the raised sections. The knob lifts out and is actually a wooden ruler with silver casing at the top of the ruler. Also at the top of the ruler, at a right angle to the ruler, is a lift-out metal piece which has a spirit level at the top end and this metal piece is used to rest on the horse to estimate its measurement in hands. There is a leather strap near the top of the walking stick for attachment to the wrist and a gold metal cap at the bottom of the stick. A silver band near the top of the stick has an inscription. ‘A G. Bendall Warrnambool’ atwell bendall, history of horse racing in the western district, history of warrnambool

This item was used to measure accurately the length of cloth on a bolt of material without unwinding it. It also measured lace, all types of textiles and spools of ribbon. It is surmised it would have been used in general stores or department stores in the late 19th and early 20th centuries. This item was discovered in the late 1980s behind an old safe at Swintons Stores in Timor Street in Warrnambool. The item appears to have been used extensively and would have been very useful during a stocktake. It may have been used in the Swinton Stores which were first established in Timor Street in 1865 with one section of the stores selling furnishings, furniture, clothing and clothing materials. The item was manufactured by A.E. Putnam of Iowa, U.S.A. There was a patent registered in 1896 and a later 'improved' model with a patent date of 1907. This item is of considerable interest because of its rarity and survival, its connection to Warrnambool General Stores in the past and its value as a research tool in local social and economic history. The possible connection to Swintons Stores is important as this business operated from 1865 to 2024 and was one of the longest-surviving family businesses in Australia. This is a rectangular-shaped wooden pole with one slightly flattened side and numbers marked on each side in patterns resembling brick walls. At the top of the pole are two wooden pieces attached to the pole by metal clips held by screws. The two wooden pieces are attached at a slight angle to the pole. The lower wooden piece is movable along the pole and has incised numbers. The wooden pieces are rectangular in shape with a large curved piece cut out to form the shape of a pennant. The maker's name is incised into the metal on the top attached wooden piece. Putnam's Cloth Chart Copyrighted 1896 Patent Pend'ggeneral stores in warrnambool, swintons stores in warrnambool, vintage measuring instrument for cloth

This is a set of 23 photographs of surveyors and support staff in the field undertaking tasks in New Guinea 1956 – 1957. The surveyors were employed in the establishment of mapping and geodetic control for Project Cutlass, the “Ship-Shore” survey of the New Ireland province. In this survey operation surveyors used theodolites to observe horizontal and vertical angles and chains to measure base line distances between survey stations. Bob Skitch shown in photo .7P was in the 2nd year of his career in the Australian Army. He achieved the rank of Lieutenant-Colonel, and his last appointment was the CO of the Army Survey Regiment from 1976 to 1980.This is a set of 23 photographs of surveyors and support staff in the field undertaking duties during Project Cutlass located in New Ireland, New Guinea 1956 – 1957. The photographs were printed on photographic paper and are part of the Army Survey Regiment’s Collection. The photographs were scanned at 300 dpi. .1) - Photo, colour, 1956. Surveyors travelling main road from Kavieng to Namatanai, New Ireland. .2) - Photo, colour, 1956. Unidentified surveyors assessing recovery of their vehicle after bridge collapsed on west side of New Ireland. .3) - Photo, colour, 1956. Unidentified surveyors assessing recovery of their vehicle after bridge collapsed over flooded creek on west side of New Ireland. .4) - Photo, colour, 1956. Survey personnel L to R: Bev Uwins, John Lambie, Bob Thompson, New Ireland. .5) - Photo, colour, 1956. Survey base camp, New Ireland. .6) - Photo, black & white, 1956-1957. Geoff Helsham with possible human remains, New Ireland. .7) - Photo, black & white, 1956-1957. Bob Skitch undertaking survey observations using Wild T2 theodolite, New Ireland. .8) - Photo, black & white, 1956-1957. Chas Beach undertaking survey observations using Wild T2 theodolite, New Ireland. .9) & .10) - Photo, black & white, 1956-1957. Kev Parker (cook) New Ireland. .11) - Photo, colour, 1957. Brian Berkery taking a break, Top Manor Island, Lihir Island Group off New Ireland. Latitude -2° 46”, Longitude 152° 40”. .12) - Photo, colour, 1957. Survey base camp L to R: Chas Beach, Bev Uwins, Feni Islands, New Ireland. Latitude -4° 05”, Longitude 153° 45”. .13) - Photo, colour, 1957. A Hous Kiap. (Kiaps, known formally as district officers and patrol officers, were travelling representatives of the British and Australian governments), New Ireland. .14) & .15) - Photo, colour, 1957. L to R: Joe Farrington, Tom Royle Bob undertaking survey observations using theodolites from an improvised timber tower, New Ireland. .16) & .17) - Photo, colour, 1957. US Army ship FS216 used for ship-to-shore triangulation docked at Rabaul, New Britain. .18) - Photo, colour, 1957. US Army ship FS216 used for ship-to-shore triangulation docked at Kavieng, New Ireland. Sight target on top of mast. .19) - Photo, colour, 1957. Survey personnel onboard US Army ship FS392, L to R: Peter Frodsham, Bob Thompson, Doc Reid, John Underwood, remainder unidentified, New Ireland. .20) - Photo, colour, 1957. Survey base line party heading ashore, New Ireland. .21) - Photo, colour, 1957. Survey personnel rowing US Army assault boat L to R: Kev Parker, Chas Beach, folded up survey beacons overhanging stern, New Ireland. .22) - Photo, colour, 1957. Les Bailey onboard US Army ship departing Rabaul, New Britain for Brisbane. .23) - Photo, colour, 1957. Ron Newman onboard US Army ship departing Rabaul, New Britain for Brisbane. Active volcano in background..1P to .23P annotated on back – ‘Operation Cutlass’, personnel names, the year and the location. royal australian survey corps, rasvy, army survey regiment, fortuna, a, army svy regt, asr, surveying

This is a set of two photographs of surveyors and support staff in the field undertaking tasks in Victoria 1956 – 1958. The surveyors were employed in the establishment of mapping and geodetic control. In this era surveyors used theodolites to observe horizontal and vertical angles and chains to measure base line distances between survey stations. This is a set of 23 photographs of surveyors and support staff in the field undertaking duties in Victoria 1956 – 1958. The photographs were printed on photographic paper and are part of the Army Survey Regiment’s Collection. The photographs were scanned at 300 dpi. .1) - Photo, colour, 1956. Surveyors enjoying a tea break. L to R: Tom Gilbert (cook), Barry Broad, Tony Slattery, John Van De Graff. Taken at Boonoonar, a locality south of Mildura. .2) - Photo, colour, 1958. Surveyors taking a break from driving. L to R: Leo Bub, Bob Thompson. Taken at Puckapunyal..1P to .2P annotated on back – personnel names, the year and the location. royal australian survey corps, rasvy, army survey regiment, asr, army svy regt, fortuna, surveying

This is a set of seven photographs of surveyors and support staff in the field undertaking duties in North Queensland in 1958. The surveyors were employed in the establishment of mapping and geodetic control. In this era surveyors used theodolites to observe horizontal and vertical angles and chains to measure base line distances between survey stations. Bob Skitch shown in photos .4P to .6P was in the 2nd year of his career in the Australian Army. He achieved the rank of Lieutenant Colonel and his last appointment was the CO of the Army Survey Regiment from 1976 to 1980. The annotation on the back of photo .5P ‘Black foreground is where Bob Skitch boiled billy and started a grass fire’.This is a set of seven photographs of surveyors and support staff in the field undertaking duties in North Queensland in 1958. The photographs were printed on photographic paper and are part of the Army Survey Regiment’s Collection. The photographs were scanned at 300 dpi. .1) - Photo, colour, 1958. Surveyor in Nth QLD enjoying a bath. L to R: Don Cocker, Bob Thompson. .2) - Photo, colour, 1958. Don Cocker surveyor in Nth QLD, enjoying a bath. .3) - Photo, colour, 1958. Surveyors Nth QLD undertaking survey observations, using MRA1 tellurometer to measure base-line distances. L to R: Len Davies, Lou Sommer, John Van De Graff. MRA1 was covered to stop overheating. .4) - Photo, colour, 1958. Surveyors south of Richmond, QLD digging holes for the erection of a Bilby observation tower. L to R: John Van De Graff, Bob Skitch, Kev Moody, Mal Hayes, Don Gray .5) - Photo, colour, 1958. Surveyors south of Richmond, QLD erecting a Bilby observation tower. L to R: Tom Royle, Bob Skitch (on ground level), Mal Hayes. .6) - Photo, colour, 1958. Surveyors south of Richmond, QLD erecting a Bilby observation tower. L to R: Tom Royle, Bob Skitch, Mal Hayes, Jim McGill (on ground level). .7) - Photo, colour, 1958. Surveyors south of Richmond, QLD undertaking survey measurements from a Bilby observation tower..1P to .7P annotated on back – personnel names, the year and the location. Annotated on back of .5P ‘Black foreground is where Bob Skitch boiled billy and started a grass fire’.royal australian survey corps, rasvy, army survey regiment, asr, army svy regt, fortuna, surveying

This is a set of 10 photographs of surveyors and support staff in the field undertaking duties in the Northern Territory and North Queensland in 1959 – 1960. The surveyors were employed in the establishment of mapping and geodetic control. In this era surveyors used theodolites to observe horizontal and vertical angles and tellurometers to measure base line distances between survey stations. Laplace survey observations seen in Photo .1P was a series of precise observations carried out at geodetic survey stations to determine astronomic latitudes, longitudes and azimuths to achieve maximum precision in the survey network. Laplace observations were necessary in a geodetic network at every 6th survey station, however the National Mapping Council specified at this time the spacing would be ideally between 4-6 survey stations. The cairn shown in photo .4P was built by RASvy as a landmark over a trigonometric survey station. It was dismantled in 1960 to enable re-occupation and survey observations. It was not restored to the condition shown in the photo.This is a set of 10 photographs of surveyors and support staff in the field undertaking duties in the Northern Territory (NT) and Queensland (QLD) in 1959 – 1960. The photographs were printed on photographic paper and are part of the Army Survey Regiment’s Collection. The photographs were scanned at 300 dpi. .1) - Photo, colour, 1959. Tony Slattery occupying a Laplace survey station on a hill in the Mount Young area of the NT. .2) - Photo, colour, 1959. Surveyors’ camp in the Mount Young area of the NT, L to R: Spencer Snow and Tony Slattery. .3) - Photo, colour, 1959. Surveyors’ camp in the Peckman Hill area, near Katherine in the NT. .4) - Photo, colour, 1959. Cairn on Trig Hill, Borroloola, NT. Built by Spencer Snow, Tom Royle and Jack McCabe. .5) - Photo, colour, 1959. Survey party taking a break next to their Austin Champ vehicle, in transit between Katherine, NT and Wyndam WA. L to R: Tony Slattery, Dave Owens, John Van De Graff. .6) - Photo, colour, 1960. Surveyors’ camp between Mount Isa, QLD and Borroloola, NT. L to R: Pat Cox and John Van De Graff prepare their meal on an open fire. .7) - Photo, colour, 1960. Surveyor - Dennis Woods undertaking survey observations, using MRA1 tellurometer to measure base-line distances NW of Mount Isa, QLD. .8) - Photo, colour, 1960. Unidentified surveyors assessing recovery of their stalled Studebaker truck vehicle after attempting a water crossing in the NT. .9) - Photo, colour, 1960. Unidentified surveyor making batches of bread at a camp in the NT. Seen in the photo placing a lid with hot coals onto the camp oven. .10) - Photo, colour, 1960. Unidentified survey party occupying a survey station on a hill in the Mount near the Lawn Hill area, NW of Mount Isa, QLD. A MRA1 tellurometer to measure base-line distances appear on the right side of the photo. .9) - Photo, colour, 1960. Unidentified surveyors assessing recovery of their stalled Studebaker truck vehicle after attempting a water crossing in the NT. .10) - Photo, colour, 1960. Unidentified surveyor making batches of bread at a camp in the NT. Seen in the photo placing a lid with hot coals onto the camp oven. .1P to .10P annotated on back – personnel names, the year and the location. royal australian survey corps, rasvy, army survey regiment, asr, army svy regt, fortuna, surveying

This is a set of five photographs of surveyors and support staff in the field undertaking duties in North Queensland and Torres Strait in 1961. The surveyors were employed in the establishment of mapping and geodetic control. In this era surveyors used theodolites to observe horizontal and vertical angles and tellurometers to measure base line distances between survey stations. In photo .2P Joe Farrington is seen taking survey observations using a Tavistock V500 Series Tavistock theodolite at a survey station between the Edward River and Aurukun in the Cape York Peninsula. The Gulf of Carpentaria appears in the background. From 1957 helicopter transport of survey parties revolutionised transport in remote areas. The civilian helicopter was hired from TAA. This is a set of five photographs of surveyors and support staff in the field undertaking duties in North Queensland and Torres Strait in 1961. The photographs were printed on photographic paper and are part of the Army Survey Regiment’s Collection. The photographs were scanned at 300 dpi. .1) - Photo, colour, 1961. Andy Millar occupying a survey station on a hill in the Cape York Peninsula, QLD. .2) - Photo, colour, 1961. Joe Farrington taking observations with a V500 Series Tavistock geodetic theodolite at a survey station in the Cape York Peninsula, QLD. .3) - Photo, colour, 1961. Daryl Parker taking a break from survey observations on a hill located on Duaun Island QLD, in the Torres Strait, a few miles south of the PNG coastline. Hill height was 975 ft. .4) - Photo, colour, 1961. Three Torres Strait divers L to R: unidentified, Darku and Ray Mau Daryl standing behind a Tavistock geodetic theodolite on a hill located on Duaun Island QLD, in the Torres Strait, a few miles south of the PNG coastline. .5) - Photo, colour, 1961. Andy Millar holding meat from a small turtle on Duaun Island QLD, in the Torres Strait, a few miles south of the PNG coastline. An unidentified Duaun Island local appears in the background..1P to .5P annotated on back – personnel names, the year and the location. royal australian survey corps, rasvy, army survey regiment, asr, army svy regt, fortuna, surveying

This is a set of four photographs of surveyors and support staff in the field undertaking duties in Dogera, Milne Bay Province and Kerema, Gulf Province of PNG in 1962. The surveyors were employed in the establishment of mapping and geodetic control. In this era surveyors used theodolites to observe horizontal and vertical angles and tellurometers to measure base line distances between survey stations. From 1957 helicopter transport of survey parties revolutionised transport in remote areas.This is a set of four photographs of surveyors and support staff in the field undertaking duties in PNG in 1962. The photographs were printed on photographic paper and are part of the Army Survey Regiment’s Collection. The photographs were scanned at 300 dpi. .1) - Photo, colour, 1962. Unloading survey operation stores from a Landing Ship Medium (LSM) at Dogera, Milne Bay Province, PNG. .2) & .3) - Photo, colour, 1962. Hired civilian helicopter Bell 47G-2 helicopters operating at at Dogera, Milne Bay Province, PNG. .4) - Photo, colour, 1962. Survey party at survey station located near Kerema, Gulf Province southern PNG. L to R: Dave Owens, Keith Broadbent, with local villagers in background..1P to .4P annotated on back – personnel names, the year and the location. royal australian survey corps, rasvy, army survey regiment, asr, army svy regt, fortuna, surveying

Sextant used by J P Larken, Government Marine SurveyorThe sextant has been the primary position fixing tool of the marine surveyor for 200 years used to measure angles between beacons or points for hydrographic surveys. A sextant in its own wooden box.On inside box lid; 'A. E. Parson surveying and scientific instrument maker, Queen Street, Melbournesextant, jp larken, marine surveyor