5 Optical instruments. .1) An Octagon of mirrors with a timber base and top. .2) Black hinged box with six circular pieces of glass (one missing) - Lens set. .3) Hinged black box with a number of 5 .4) Box with handle with a number of boxes and five pieces of glass (one missing) .5) Black hinged casewith 5 pieces of shaped glass and a mirror attached to wood, and a metal item (one piece is missing) - lens set.scientific instruments, scientific objects

Grey hammertone cylindrical house with removable lid. Compass equipped with sighting wire and slot attachments. "Sirius" Mounting flange on bottom face with 17mm diameter female screw head. Tan leather carry case.scinetific instrument, scientific object, compass, esdale & sons

Used by forestry students for teaching and researchBausch and Lomb Optical Company Microscope, serial no: UK7578, in wooden cabinet with three objectives and two lenses.Bausch and Lomb Optical Company Rochester, NY, USA. UK7578. Cabinet: Australia, Watson Victor Limited, New Zealand

Periscope Binocular - Green except for section that the eyes look into.MKI /3 MILS 1240-66-022-4932. 1952 AK&S PB 7584binocular - periscopic.

Periscopic Binocular Case - Green Has two latches to close lid,and chain.Binocular. Periscopic, A.F.V. Cased MK1/3 m L5 1240 - 66 - 052 - 4953 Case 053087A /AK & Sbinocular periscopic

Bausch & Lomb were a prominent manufacturer of optical glass and instruments founded in 1853, which commenced making microscopes in 1876. Entered into joint venture with Saegmuller and alliance with Zeiss 1890s - 1903, now global manufacturer of eye products and pharmaceuticals. Possibly used in Australia as a laboratory microscope 1930-1950s.Brass monocular 3 lens (16 mm, 4 mm) laboratory microscope in cedar stained wooden box with key lock and carry handle, with glass specimen slides Plate on base: Bausch & Lomb Optical Co. USA, Logo B L Z S (Bausch Lomb Saegmuller Zeiss), Donald Ross & Co Ltd [Distributor/Agent]microscope

How widely the prisoptometer was used is unclear but the Standard Optical Company later patented a new model, The Standard Prisoptometer, on June 21, 1904. Edward Jackson's crossed cylinder technique of determining astigmatism was first detailed in the Transactions of the American Ophthalmological Society (1887)4:595-598. The convenience of Jackson's crossed cylinder lenses over the prisoptometer in weight, cost, portability and reliability meant that they were soon almost universally adopted.This is a rare item as few are known world wide.This instrument is an optometer, that is, a device to measure the refractive error of an eye. It is made of cast iron, steel, brass and glass. It contains a prism which could be rotated, and was used to view a disc or an object circle. The prism caused monocular doubling of the object circle and the separation of the two images varied as the prism rotated, depending on the astigmatism present. The axis of the astigmatism was indicated by the prisoptometer and trial lenses were used to determine the the magnitude of the spherical and cylindrical refractive errorImprinted:"DR CULBERTSON'S PRISOPTOMETER/ GENEVA OPTICAL COMPANY MAKERS, GENEVA, N.Y./ PATENTED SEPT, 21, 1886". Stamped "853" on eyepiece and lens mounting.optometry, prisoptometer, optometer, astigmatism, refractive error, refraction, culbertson

This collection of eight photos was most likely taken in circa 1982-1983, featuring the removal of AUTOMAP 1’s Gerber Optical Line Following (OLF) scanner Sub-System from Air Survey Squadron’s Building 16, in preparation for the installation of the replacement AUTOMAP 2 system. Introduced in 1975, the AUTOMAP 1 computer assisted cartography and mapping system was the first computer assisted cartography and mapping system utilised by the Survey Corps and the first system used by Australian mapping organisations. The Gerber OLF scanner was mainly used to digitise contours on a map sheet separation with individual lines at least 0.125 mm wide and no closer than 0.25 mm to the next line. The operator initiated the OLF by placing its light sensitive digitizing head on a contour line. The OLF could digitise up to 50 mm per second on straight lines and complete an average density contour sheet in approximately 8 hours. The operator occasionally intervened to restart the OLF to allow it to continue if it failed to correctly discriminate the contours. The history of the AUTOMAP 1 system is covered in more detail with additional historic photographs, in pages 116-118 of Valerie Lovejoy’s book 'Mapmakers of Fortuna – A history of the Army Survey Regiment’ ISBN: 0-646-42120-4. See items 6122.20P, 6183.19P, and 6184.20P for additional photographs of AUTOMAP 1’s Gerber OLF in operation.This is a set of eight photographs of the removal of AUTOMAP 1’s Gerber Optical Line Following (OLF) scanner Sub-System from Air Survey Squadron’s Building 16, at the Army Survey Regiment at Fortuna, Bendigo, circa 1982-1983. The photographs are on 35mm negative film and scanned at 96 dpi. They are part of the Army Survey Regiment’s Collection. .1) to .8) - Photo, black & white, c1982-1983, - Gerber Optical Line Follow (OLF) removal from Air Survey Squadron’s Building 16..1P to .8P – There are no annotationsroyal australian survey corps, rasvy, fortuna, army survey regiment, automap 1

"Bainbridge Veterinary Instruments", catalogue, c.1988. Published by Bainbridge Bros., surgical and veterinary instrument makers and precision engineers, North Fitzroy.Book / catalogue of veterinary instruments produced by Bainbridge Bros., c.1988.animal health, bainbridge bros, veterinary instruments

While telescopes and binoculars each have a long history, handheld optical telescopes were still widely used in the Nineteenth Century. The origins of this small optical telescope are unclear, apart from that it was used by a family in Kew in the 1880s.Brass, brown leather and glass telescope, anecdotally recorded as used by an early Kew family at sports days in the 1880sSeparate later label: "Early telescope owned by a Kew family & used on Sports Day in 1880s"sports - kew (vic), optical telescopes, hand-held telescopes

An optical table is a piece of equipment used for optics experiments and engineering. The Optical Bench is a less sophisticated piece of equipment used for simple experiments. Components such as light sources and lenses can be bolted down and easily shifted along the length of the rail.A solid wood board. A steel ruler scale on top, 0-30mm, mounted along one edge. Fixed along the opposite edge is a 10mm diam. steel bar, 41cm long.W.G. Pye & Co. Eng. Cambridge.physics, scientific instrument, optics, engineering, light sources, lenses, optical table

Would have been used in electrical engineering laboratory experiments. Slip inside of lid indicates that the instrument would have been checked at times for accuracy of readings. This was checked and passed on 28 November 1959.Wattmeter, portable, in varnished wood case with leather strap handle. Hinged lid with calibration chart inside the lid. Range - 0 to 1.5. Voltage ranges: 150v; 300v; 600vSerial No 2927 Dated: 28/11/58 Signature: J J Abbott A J William Electrical Instruments, Melbourne, C.1. Dymo tape on front side: WATTMETER 0 - 1.5 kwwattmeter, portable, electrical engineering, experiments, dynamometer type, scientific instrument

Used at BIAE in petrology laboratoryAn optical, petrographic, polarizing microscope with a single objective lens in a blonde timber case with key. Black enamel frame, chrome accessories.POS marking on steel plate Olympus Tokyo 202108 engraved on barrel On Box door "P6" engraved labelmicroscope, polarizing microscope, olympus optical co. ltd, ballarat institute of advanced education, petrology laboratory, scientific instrument

metal drawing instruments in wooden box, instruments have pencil or ink attachmentsengineering tools, drawing instruments

The history of spectacles The earliest form of spectacles are generally agreed to have been invented in Northern Italy in the thirteenth century. Over hundreds of years of innovation and refinement, they have been perfected into the stylish and functional designs you see today worn by millions of people to correct their eyesight. Here's a look at the key moments that defined the history of spectacles. Thirteenth century - Rivet spectacles The earliest form of spectacles was simply two mounted lenses riveted together at the handle ends. They had no sides and were secured to the face by clamping the nose between the rims, some of which had notches which may have been intended to improve the grip. Even then the wearer could only keep them in place by remaining relatively still and would normally support them with the hand. These spectacles contained convex lenses for the correction of presbyopic long-sightedness and were generally suited only to those few who lived beyond their forties and had the ability to read. Sixteenth century - Nose spectacles Nose spectacles were in more common use by the early sixteenth century. These often had a bow-shaped continuous bridge, almost of a modern appearance, that was sometimes flexible depending upon the material, for example leather or whalebone. The bridge was as much an area to be gripped as to rest on the nose. Spectacles were still usually held in place with the hand whilst being used temporarily for a brief period of reading or close inspection. By now the lenses could be used to correct both long and short sight. The general design changed little through the seventeenth century, though certain refinements increased the flexibility and comfort for some wearers. In some localised areas, notably in Spain, people experimented with ear loops made of string. This allowed them to walk around with their spectacles on. Eighteenth century - Temple glasses Only in the eighteenth century did the first modern eyewear, or ‘glasses’ as we would understand them, start to appear. The lenses might be glass, rock crystal or any other transparent mineral substance and were prone to smashing if the spectacles fell off, so there was an impetus to develop frames that could be worn continuously and would stay in place. London optician Edward Scarlett is credited with developing the modern style of spectacles which were kept in place with arms, known as ‘temples’. These were made of iron or steel and gripped the side of the head but did not yet hook over the ears because often the ears were concealed beneath a powdered wig, such as was fashionable at the time. As temples developed they were made with wide ring ends through which the wearer could pass a ribbon, thus tying the spectacles securely to the head. As spectacles were no longer primarily for use in sedentary activities, people began to be noticed out and about in their spectacles and might come to be identified as a ‘spectacle wearer’. By the end of the eighteenth century, people who needed correction for both distance and near could choose bifocals. Nineteenth century - Pince-nez Pince-nez were a nineteenth century innovation that literally translates as ‘pinching the nose’. They had a spring clip to retain the item in place under its own tension. Sometimes this clip was too tight and the wearer struggled to breathe. If it was too loose the pince-nez could fall off so, for safety and security, they were often connected to the wearer's clothing by a cord or a chain to avoid them being dropped or lost. Pince-nez were sometimes chosen by people who felt that large spectacles were too prominent and drew attention to a physical defect. They were also suitable for mounting lenses that could correct astigmatism. Twentieth century spectacles Spectacle wearing continued to become more widespread, key developments being the supply of spectacles to troops in the First World War, cheaper spectacles being subsidised through insurance schemes arranged by friendly societies, and the beginning of the National Health Service in 1948, when free spectacles were made available to all who might benefit from them. This normalised spectacle wearing and led to a significant increase in the scale of production. Entirely separate categories of women’s spectacles and sports eyewear both emerged in the 1930s. The latter half of the twentieth century saw spectacles become more fashionable and stylish as frames with different shapes, materials, and colours became available. Plastics frames, in particular, allowed a greater choice of colours and textured finishes. Plastic lenses were more durable and could be made lighter and thinner than glass, spurring a renewed interest in rimless designs. Designer eyewear bearing popular high-street brand names encouraged patients to regard spectacles as a desirable commodity, even as a fashion accessory, not just a disability aid. https://www.college-optometrists.org/the-british-optical-association-museum/the-history-of-spectacles The company Optical Prescription Spectacle Makers (OPSM ) was formed in Sydney in 1932 and publically listed in 1953. These spectacles and case were used by Dr. Angus when testing patients' eyes. The spectacles and case were donated to Flagstaff Hill Maritime Village by the family of Doctor William Roy Angus, Surgeon and Oculist. It is part of the “W.R. Angus Collection” that includes historical medical equipment, surgical instruments and material once belonging to Dr Edward Ryan and Dr Thomas Francis Ryan, (both of Nhill, Victoria) as well as Dr Angus’ own belongings. The Collection’s history spans the medical practices of the two Doctors Ryan, from 1885-1926 plus that of Dr Angus, up until 1969. ABOUT THE “W.R.ANGUS COLLECTION” Doctor William Roy Angus M.B., B.S., Adel., 1923, F.R.C.S. Edin.,1928 (also known as Dr Roy Angus) was born in Murrumbeena, Victoria in 1901 and lived until 1970. He qualified as a doctor in 1923 at University of Adelaide, was Resident Medical Officer at the Royal Adelaide Hospital in 1924 and for a period was house surgeon to Sir (then Mr.) Henry Simpson Newland. Dr Angus was briefly an Assistant to Dr Riddell of Kapunda, then commenced private practice at Curramulka, Yorke Peninsula, SA, where he was physician, surgeon and chemist. In 1926, he was appointed as new Medical Assistant to Dr Thomas Francis Ryan (T.F. Ryan, or Tom), in Nhill, Victoria, where his experiences included radiology and pharmacy. In 1927 he was Acting House Surgeon in Dr Tom Ryan’s absence. Dr Angus had become engaged to Gladys Forsyth and they decided he would take time to further his studies overseas in the UK in 1927. He studied at London University College Hospital and at Edinburgh Royal Infirmary and in 1928, was awarded FRCS (Fellow from the Royal College of Surgeons), Edinburgh. He worked his passage back to Australia as a Ship’s Surgeon on the on the Australian Commonwealth Line’s T.S.S. Largs Bay. Dr Angus married Gladys in 1929, in Ballarat. (They went on to have one son (Graham 1932, born in SA) and two daughters (Helen (died 12/07/1996) and Berenice (Berry), both born at Mira, Nhill ) Dr Angus was a ‘flying doctor’ for the A.I.M. (Australian Inland Ministry) Aerial Medical Service in 1928 . The organisation began in South Australia through the Presbyterian Church in that year, with its first station being in the remote town of Oodnadatta, where Dr Angus was stationed. He was locum tenens there on North-South Railway at 21 Mile Camp. He took up this ‘flying doctor’ position in response to a call from Dr John Flynn; the organisation was later known as the Flying Doctor Service, then the Royal Flying Doctor Service. A lot of his work during this time involved dental surgery also. Between 1928-1932 he was surgeon at the Curramulka Hospital, Yorke Peninsula, South Australia. In 1933 Dr Angus returned to Nhill where he’d previously worked as Medical Assistant and purchased a share of the Nelson Street practice and Mira hospital from Dr Les Middleton one of the Middleton Brothers, the current owners of what was once Dr Tom Ryan’s practice. Dr L Middleton was House Surgeon to the Nhill Hospital 1926-1933, when he resigned. [Dr Tom Ryan’s practice had originally belonged to his older brother Dr Edward Ryan, who came to Nhill in 1885. Dr Edward saw patients at his rooms, firstly in Victoria Street and in 1886 in Nelson Street, until 1901. The Nelson Street practice also had a 2 bed ward, called Mira Private Hospital ). Dr Edward Ryan was House Surgeon at the Nhill Hospital 1884-1902 . He also had occasions where he successfully performed veterinary surgery for the local farmers too. Dr Tom Ryan then purchased the practice from his brother in 1901. Both Dr Edward and Dr Tom Ryan work as surgeons included eye surgery. Dr Tom Ryan performed many of his operations in the Mira private hospital on his premises. He too was House Surgeon at the Nhill Hospital 1902-1926. Dr Tom Ryan had one of the only two pieces of radiology equipment in Victoria during his practicing years – The Royal Melbourne Hospital had the other one. Over the years Dr Tom Ryan gradually set up what was effectively a training school for country general-practitioner-surgeons. Each patient was carefully examined, including using the X-ray machine, and any surgery was discussed and planned with Dr Ryan’s assistants several days in advance. Dr Angus gained experience in using the X-ray machine there during his time as assistant to Dr Ryan. Dr Tom Ryan moved from Nhill in 1926. He became a Fellow of the Royal Australasian College of Surgeons in 1927, soon after its formation, a rare accolade for a doctor outside any of the major cities. He remained a bachelor and died suddenly on 7th Dec 1955, aged 91, at his home in Ararat. Scholarships and prizes are still awarded to medical students in the honour of Dr T.F. Ryan and his father, Dr Michael Ryan, and brother, John Patrick Ryan. ] When Dr Angus bought into the Nelson Street premises in Nhill he was also appointed as the Nhill Hospital’s Honorary House Surgeon 1933-1938. His practitioner’s plate from his Nhill surgery states “HOURS Daily, except Tuesdays, Fridays and Saturday afternoons, 9-10am, 2-4pm, 7-8pm. Sundays by appointment”. This plate is now mounted on the doorway to the Port Medical Office at Flagstaff Hill Maritime Village, Warrnambool. Dr Edward Ryan and Dr Tom Ryan had an extensive collection of historical medical equipment and materials spanning 1884-1926 and when Dr Angus took up practice in their old premises he obtained this collection, a large part of which is now on display at the Port Medical Office at Flagstaff Hill Maritime Village in Warrnambool. During his time in Nhill Dr Angus was involved in the merging of the Mira Hospital and Nhill Public Hospital into one public hospital and the property titles passed on to Nhill Hospital in 1939. In 1939 Dr Angus and his family moved to Warrnambool where he purchased “Birchwood,” the 1852 home and medical practice of Dr John Hunter Henderson, at 214 Koroit Street. (This property was sold in1965 to the State Government and is now the site of the Warrnambool Police Station. ). The Angus family was able to afford gardeners, cooks and maids; their home was a popular place for visiting dignitaries to stay whilst visiting Warrnambool. Dr Angus had his own silk worm farm at home in a Mulberry tree. His young daughter used his centrifuge for spinning the silk. Dr Angus was appointed on a part-time basis as Port Medical Officer (Health Officer) in Warrnambool and held this position until the 1940’s when the government no longer required the service of a Port Medical Officer in Warrnambool; he was thus Warrnambool’s last serving Port Medical Officer. (The duties of a Port Medical Officer were outlined by the Colonial Secretary on 21st June, 1839 under the terms of the Quarantine Act. Masters of immigrant ships arriving in port reported incidents of diseases, illness and death and the Port Medical Officer made a decision on whether the ship required Quarantine and for how long, in this way preventing contagious illness from spreading from new immigrants to the residents already in the colony.) Dr Angus was a member of the Australian Medical Association, for 35 years and surgeon at the Warrnambool Base Hospital 1939-1942, He served as a Surgeon Captain during WWII 1941-45, in Ballarat, Victoria, and in Bonegilla, N.S.W., completing his service just before the end of the war due to suffering from a heart attack. During his convalescence he carved an intricate and ‘most artistic’ chess set from the material that dentures were made from. He then studied ophthalmology at the Royal Melbourne Eye and Ear Hospital and created cosmetically superior artificial eyes by pioneering using the intrascleral cartilage. Angus received accolades from the Ophthalmological Society of Australasia for this work. He returned to Warrnambool to commence practice as an ophthalmologist, pioneering in artificial eye improvements. He was Honorary Consultant Ophthalmologist to Warrnambool Base Hospital for 31 years. He made monthly visits to Portland as a visiting surgeon, to perform eye surgery. He represented the Victorian South-West subdivision of the Australian Medical Association as its secretary between 1949 and 1956 and as chairman from 1956 to 1958. In 1968 Dr Angus was elected member of Spain’s Barraquer Institute of Barcelona after his research work in Intrasclearal cartilage grafting, becoming one of the few Australian ophthalmologists to receive this honour, and in the following year presented his final paper on Living Intrasclearal Cartilage Implants at the Inaugural Meeting of the Australian College of Ophthalmologists in Melbourne In his personal life Dr Angus was a Presbyterian and treated Sunday as a Sabbath, a day of rest. He would visit 3 or 4 country patients on a Sunday, taking his children along ‘for the ride’ and to visit with him. Sunday evenings he would play the pianola and sing Scottish songs to his family. One of Dr Angus’ patients was Margaret MacKenzie, author of a book on local shipwrecks that she’d seen as an eye witness from the late 1880’s in Peterborough, Victoria. In the early 1950’s Dr Angus, painted a picture of a shipwreck for the cover jacket of Margaret’s book, Shipwrecks and More Shipwrecks. She was blind in later life and her daughter wrote the actual book for her. Dr Angus and his wife Gladys were very involved in Warrnambool’s society with a strong interest in civic affairs. Their interests included organisations such as Red Cross, Rostrum, Warrnambool and District Historical Society (founding members), Wine and Food Society, Steering Committee for Tertiary Education in Warrnambool, Local National Trust, Good Neighbour Council, Housing Commission Advisory Board, United Services Institute, Legion of Ex-Servicemen, Olympic Pool Committee, Food for Britain Organisation, Warrnambool Hospital, Anti-Cancer Council, Boys’ Club, Charitable Council, National Fitness Council and Air Raid Precautions Group. He was also a member of the Steam Preservation Society and derived much pleasure from a steam traction engine on his farm. He had an interest in people and the community He and his wife Gladys were both involved in the creation of Flagstaff Hill, including the layout of the gardens. After his death (28th March 1970) his family requested his practitioner’s plate, medical instruments and some personal belongings be displayed in the Port Medical Office surgery at Flagstaff Hill Maritime Village, and be called the “W. R. Angus Collection”. The W.R. Angus Collection is significant for still being located at the site it is connected with, Doctor Angus being the last Port Medical Officer in Warrnambool. The collection of medical instruments and other equipment is culturally significant, being an historical example of medicine from late 19th to mid-20th century. Dr Angus assisted Dr Tom Ryan, a pioneer in the use of X-rays and in ocular surgery. Spectacles and case, from the W.R. Angus Collection and used by Dr. Angus testing the sight of his patients. Metal case covered in red leather, black velvet lining. Tan rimmed spectacles. Maker is OPSM. Inscriptions on case, inside case and on spectacle rim.Inscribed on spectacle arms “CONTORA”. Inscription on case in gold print “OPSM Optical Prescription Spectacle Makers Pty Ltd”. Inscription on white oval label inside case is illegible. flagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, dr w r angus, spectacles and case, optical testing, optometrist examination, opsm optical prescription spectacle makers

This item was most probably used at the Ballarat School of Mines. Pajari Instruments Ltd. grew from a partnership established in 1945 when the first EX-AX surveying instrument that provided accurate azimuth and inclination was made available to the diamond drilling industry. The partnership between Charles Trotter and George Pajari Sr. was known as Trotter-Pajari Instruments and the EX-AX Instrument was dubbed the "TROPARI" by the diamond drilling industry. Charles Trotter, a mechanical engineer, was also a marketing genius who developed substantial demand in Australia, Africa and South America in the 1940's and early 1950's. In fact the sales to each of these continents exceeded those to North America during those early years. Pajari is located in Orillia, Ontario, Canada and offer services and products that assist customers with their individual requirements. After the death of Charles Trotter in 1956, George Pajari Sr. with the assistance of his wife Hilda continued the business under the title of Pajari Instruments. George Sr. set most of the tenets that comprise our present Mission Statement. If it wasn't user friendly or if it had to have experts to operate it, that instrument design was doomed. If the customer wasn't getting good value in his opinion, manufacturing and repair procedures were examined to see where efficiency could be improved to cut costs without sacrificing Quality. George Pajari Jr and his wife Darlene assumed the reins of Pajari Instruments Ltd. in 1981 when George Sr. decided on semi-retirement. George Jr. brought the "client geologist's" perspective to the company. The company moved from Toronto to a 30 hectare (80 acre) site near Orillia shortly afterward. This site provided the high magnetic latitude earth field environment without magnetic pollution that is necessary for accurate compass setting. The park like setting of this location is a positive psychological benefit for our staff. George Sr. passed away in 2002 being preceded by Hilda only by 3 months, George Jr. continues at the helm of the company. With dedication from long term employees/contractors and third generation family members, Pajari Instruments Ltd. continues operations/new product development in Orillia. (http://www.pajari.com/about.html) Brass levelling compass in green velvet lined hinged timber box. Known as a Tropari - a single-shot, micro-mechanical borehole surveying instrument operated by a timing device. Borehole direction is measured from the earth's magnetic field. The Tropari provides both direction and inclination which can be used to define the attitude of the borehole at the survey depth. Regular surveys at intervals as the borehole progresses will allow a plot of the borehole to be drawn from the data. The Tropari is easy to use and maximizes profits by minimizing capital and operational costs. The Basic Survey Train Consists of: PDSI / Tropari Container, 6m (20 ft) Nonmagnetic Rods, Impact Foot, and Connector at Top. (http://www.pajari.com/tropari.html) A sticker on the lid of the hinged box states: "A.E. Parsons 107 Leicester St., Carlton 3053 Telephone 347 5844"scientific instrument, compass

Oval silicon mould depicting a trio of stringed instruments. Nonematcham skipper, mould, jewelllery, stringed instruments

colour photograph of man with musical instruments on back of truck

This Diagnostic Kit is a fair example of medical equipment used within mental asylums in the 19th and 20th centuryBlack wooden box, fabric covered. Contains stainless steel instruments.'Gowllands' Made in Englandmedical, set, instruments, diagnostic

George Lee Lawrence (1901–1976) established a firm in Chicago to make slide rules for photography. In 1935 he moved to Wabash, Ind., renamed the company Lawrence Engineering Service, and began to manufacture general purpose slide rules. In 1938 he relocated once more to Peru, Ind., and in 1947 it was changed to Engineering Instruments, Inc., and the company remained in business until its building burned down in 1967. The model 10-B sold for 25 cents during this period. There is no record that Lawrence ever received a patent for any aspect of his design or manufacturing process.Used up to the 1960s prior to the invention of the electronic calculator.10 inch one-sided wooden slide rule painted white on the front face, which consists of two divided scales, one fixed and on movable, and a sliding window called a cursor. A, D, and K scales are on the base, and B, CI, and C scales the inside of the slide. The underside of the rule is marked with: tables for equivalents and conversions. Housed in cardboard box with instruction booklet.The top of the base is marked: MADE IN U.S.A. It is also marked ENGINEERING INSTRUMENTS, INC., PERU, INDIANA and PAT. PEND. Underside: This Famous Slide Rule... at a popular price. Solves Problems in Multiplication, Division, Proportion, Squares Roots, Cubes and Cube Roots, Reciprocals, etc., Instantly. Accurately Calibrated White Face on Well Seasoned Hardwood. Both ends of box: MODEL 10B-BK Price of 15 shillings handwritten on box.slide rule, mathematics

Grey/brown hardcover book with cloth covering produced as a trade catalogue for surgical instruments and appliances, including anaesthetic equipment and apparatuscatalogue, surgical instrument, anaesthetic device, anaesthetic equipment, anaesthetic apparatus, anaesthesia, anaesthetic, surgery

Small Binoculars Signal Corps U.S. Army. Metal with rubber eye protector Imitation leather cover with leather strap.SIGNAL CORPS,US.ARMY 1449 on front left lens piece, Serial No EE 73984 AM 6E/360 on front right lens piece. Circle with " Prism Stereo 30 ml Apart Power" written inside on back left side of lens piece. Circle with "Bausch & Lomb Optical Co.( Triangle in middle with USA inside) Rochester NY. " written inside on back right side of lens piece.

b&w photograph of instrument presentation from CO 5 RAR Lt Col Colin (Ghengis) Khan to CO 1st Australian FD Hospital Lt Col Ray Hurley OBEsurgical instruments, lt col (ghengis) khan, lt col ray hurley