Black and white photograph entitled “G.A. Ampt and E.J. Hartung and experimental pots of opitcal glass” Duplicate of no. 158On back of image in ink: “37 L to R: G.A. Ampt and Prof. Hartung”, “1886-1953 see ADB Vol 7” On front of image in ink: “37”

Black and white photograph portrait of G.F. DaintyOn front of image in ink: “4” On back of image: “5”, “No. 5 G.F. Dainty”. See History of Object for transcript.

Black and white photograph of Henri Rathgeber looking through equipment. On front of image in ink: “6” On back of image in pencil: “No. 6 Henri Rathgeber” On back of image in ink: “6”

Black and white photograph of two scientists at work (A.C. Goodwin and Peter Law).On front of image in ink: “8” On back of image in pencil: “No. 8 A.C. Goodwin Peter Law” (L to R) On back of image in ink: “8”

Black and white photograph of two scientists at work (A.C. Goodwin and Peter Law). On front of image in ink: “9” On back of image in pencil: “No. 9 A.C. Goodwin Peter Law” (L to R) On back of image in ink: “9”

Black and white photograph of two scientists (J.B. Willis and P.G. Law) at work on microscope On front of image in ink: “31A” On back of image in pencil: “31A J.B. Willis, P.G. Law ” (L to R) On back of image in ink: “31A”

Black and white photograph of male scientist (Kahanine) working on graphic design. On front of image in ink: “31” On back of image in pencil: “No. 31 Kahanine’ On back of image in ink: “31”

Black and white photograph showing male hands preparing glass for fusing. Same photo as 144. On front of image in ink: “24” On back of image in pencil: “No. 24 Glass Preparation for fusing” On back of image in ink: “24”

Black and white photograph showing young man (Notman) working on graphic designs at a draft board. On front of image in ink: “19” On back of image in pencil: “Notman No. 19” On back of image in ink: “19”

Black and white photograph showing Gordon Crickmore using compass. Same photo as 136. On front of image in ink: “16” On back of image in pencil: “No 16 Gordon Crickmore” On back of image in ink: “16”

Black and white photograph Dick Huey at work assembling plate glass for making gla blocks. Same photo as 147 On front of image in ink: “27” On back of image in pencil: “No 27” On back of image in ink: “27”

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

Part of collection of various maritime artefacts donated by Bill LibbyAn extendable telescope with its own leather case and strap.International code flags label on body of telescopetelescope, optical instrument, leather case

Opera glasses from the family collection of the McIntyre familyPair of brass and ivory opera glasses with a fitted brown suede carrying case, lined with blue silk. Donated by Dione McIntyre in 1995optical instruments, dione mcintyre, opera glasses

This hand painted prosthetic eye would have been used for people who have had to have an eye removed due to damage or disease. The prosthesis fits over an orbital implant and under the eyelids. Often referred to as a glass eye, the ocular prosthesis roughly takes the shape of a convex shell. 1 prosthetic white glass eye with blue iriskerri wilson optical prosthetics, prosthetic eye

The seven weights (0008.4 and 0136.3) are circular in shape with a hole in the centre and a groove cut across the radius. They were specifically designed to fit into a weight tube, which allowed movement of the weights that were used for driving the clockwork mechanism for turning the lighthouse lens. They are most likely original to the Chance Brothers system installed in 1913, which was originally equipped with a set of ten, each weighing around thirty kilograms.The weights were moved vertically in similar fashion to the way weights move on a grandfather clock. As the weight fell, the optic clock was driven and the lens was turned. To keep the clock turning, the weight needed to be wound back up to the top of its travel. Lighthouse keepers had to constantly wind the clock to keep the light active, and at least two keepers needed to observe a strict roster of hours. When electric motors were invented, weights became obsolete and the motors were able to turn the optic for as long as there was power to drive them. Wilsons Promontory’s Chance Bros. kerosene operated light, which was turned by a clockwork mechanism, was replaced by small electric motor in 1975, reducing the number of keepers and eliminating the need for weights. Cape Schanck has a set of fourteen weights remaining in situ in the lighthouse weight tube as well as another four detached weights, two of which may be associated with the 1859 mechanism. A small number of detached cast iron weights and two associated rods remain at the Point Hicks Lightstation and one weight is displayed in the lantern room at Cape Otway.The Wilson Promontory weights have first level contributory significance for the insights they provide into the technology and operations of a late nineteenth/early twentieth century lighthouse which has since been superseded. They are well provenanced and are significant for their historical value as part of the lightstation’s Chance Brothers optical system installed in 1913.Four circular disc shaped lead weights, all with a narrow section cut out to the middle of shape. (as in slice of cake)

Margaret MitchellA rare and vintage gold painted metal Designoscope or Kaleidoscope with a prism and turntable for creating a kaleidoscopic effect. It is very rusted and worn. It has a triangular metal tube and a heavy base. It was designed for artists and illustrators rather than children. It has a coloured separate label."Designoscope British Made"kaleidoscopes, leisure object, optical toys