From label: Remnants of the “J” Apparatus beam balance for the measurement of the mechanical equivalent of heat. The solid object is the rotating magnet the construction of which is illustrated on the cover of \\\"A man Ahead of his Times\\\". Made in the Nat. Phil. Workshop for J experiment.Three components of “J” Calorimeter made of metal and covered in green enamel. One small weight from 33.3 has become detached from string.

Gas-powered engine used to drive Grayson’s original ruling engine (Cat. no. 35) Because of frequent failures of the electric power supply, Grayson preferred to use a hot-air engine, driven by a gas flame, to turn the engine so that, once a ruling had commenced, it would continue uninterrupted until the end.

Made by Henry Grayson at home with the help of William Stone. Used to rule diffraction gratings, achieving excellent results of 2cm squared rulings on speculum metal. The instrument was transferred to Melbourne University, and used by Professor Lyle from 1917-30. Information attached to the front of object and statistical information on stand on top of object.Grayson Diffraction Grating Ruling engine consisting of multiple complex chrome and brass components. Enclosed in specially made glass and wooden display box.

Cambridge Optical Pyrometer constructed with round black face erected on wooden tripod. A single yellow wire about 1 metre length is left floating (i.e. wrapped round one leg).On face: “Degree Centigrade Cambridge Optical Pyrometer ?The Cambridge Scientific Instrument Co. Ltd Cambridge England No. 42610”

Double Prism Optical Spectrograph made of standing L-shaped metallic base in grey enamel which supports a brass collimator/telescope abutting a wooden box containing two prisms and camera. Tradition has it that it was designed by Laby but there is no supporting evidence.Engraved on brass cylinder: “Adam Hilger Ltd London England” On end of brass cylinder: “Screw = 5m/m Adam Hilger Ltd London England No. F31.301/25403”

Black and white photograph of “J” Apparatus laboratory (refer to Reg No. 33 and Reg No. 34). Laminated photograph is mounted on wood and secured with masking tape. Metal hook on back for hanging. Frame is painted black.Stamped on back: “Artfilm Laminating Block Mounting Specialists, 337 Balwyn Road, North Balwyn 3104. Tel: 816 3691”

Round glass lens stored in rectangular cardboard box with lid and supported by cotton wool.On inside of box in pencil: “20/1/40 (?dictatomigialls of l/4). On top of box: “wray flat”.

Test plate rectangular glass slide with rulings under circular cover glass within yellow circle and brown border enclosed in red hinged box with blue lining. Described as “A sample Microscope slide - Test plate with rulings from 30,000 to 120,000 per inch”. This is the only surviving ruling reaching up to 120,000; hence is both unique and valuable.Labels on slide: “Test plate 10,000 to 120,000. Ruled by H.J. Grayson, Melbourne”. No of lines per inch Band 1-10,000 2-20,000”. On label on side: “No of lines per inch Band 3 -30,000 4 - 40,000 5-50,000 6-60,000 7-70,000 8-80,000 9-90,000 10-100,000 11-110,000 12-120,000”

8 micrometer (microscope) test slides stored in wooden box with storage slots. Cardboard label inside box: “From Melbourne University Physics Dept Museum. Probably Grayson trials or William Stone” “ Microrulers/W S” on lidOn box: “Micronmemters W.S.” On 43.2: unlabeled, with glass rectangle 30x10mm cemented on microslide On 43.3: red and gold emblem/”Micronmemter 100 and 1000 in an inch” On 43.4: “Depth 0.10 mm; contents of 4 squares 0.001 C.mm ” On 42.5: unlabeleed square 9 x 7 mm. On 43.6: “1/100 1/500 inch” On 43.7: “200/inch 500/ inch 1000/ inch 2000/ inch” On 43.8: “1/100 1/500 inch” On 43.9: “Heavy lines up to 70,000. Higher Lines broken up” : “120X”(??)

Slide showing Wallace’s Replica of Rowland’s Plane.Typed label on slide: “Wallace’s Replica of Rowland’s Grating 14500 lines to the inch Central Scientific Company, Chicago ILL” Label on box: “Diffraction Grating (Wallace) 14500 lines/inch”

Blank clear slide with cardboard box. Loose paper with slide “Plane parallel flat for adjustment of spectrometer”.

Glass slide with three “silver ” circles enclosed in small hinged brown leather box lined with black velvet. No calibration ruling details available.On box: “Diffraction splatte nach ABBE C.Zeiss Jena”

Part of the Laby CollectionCanon tele-converter camera lens stored in black accessory boxoptical equipment

Business card belonging to Betty Laby inside.Cannot QL17 model camera. Silver and black compact rangefinder with associated storage case.

Brown camera accessory box containing assorted accessories and flash bulbs

Camera and accessory box with accessories and handbook stored inside.

Part of the Laby Collection.Black camera box containing camera, accessories and handbooks inside.Labels identifying Jean Laby on strap and body.

Blue spiral bound report titled 'Stratospheric Winds Over Australia'.

Brown and black, hardcover stamp collector's album titled 'The International Stamp Album' and featuring pages sectioned by country with a grid layout for adhering stamps. A mix of blank pages and pages with various numbers of stamps.