Triangular, footed base with coiled, coated wire on adjustable stand between side of tuning fork. NOTE: HEAVY OBJECTFront of tuning fork base: '100 / V. D' Sticker on base: '1D4' Stamped on base of fork: 'GRIFFIN & TATLOCK / LONDON' Plaque on base: 'GRIFFIN & TATLOCK LTD / LONDON / GLASGOW / EDINBURGH / [griffin logo] / MANCHESTER / LIVERPOOL' Sticker on side of base: 'NAT. PHIL. LAB / NO / UNIV. OF MELB.'tuning fork, griffin & tatlock, laboratory apparatus, electromagnetic

The investigation of the x-ray appears early on to have been a priority research topic at the University of Melbourne’s School of Physics. This interest was sparked by the appointment in 1889 of Professor T.R. Lyle. Lyle, who was head of the school until 1915, is thought to have been the first person in Australia to have taken an x-ray photograph. A copy of this photograph can be found in the School of Physics Archive. For this particular experiment Lyle actually made his own x-ray tube. His successor, Professor Laby, continued to work with x-rays. During the 1920s Laby worked on the x-ray spectra of atoms and in 1930 he co-published with Dr. C.E. Eddy, Quantitative Analysis by X-Ray Spectroscopy. Also with Eddy, Laby produced the landmark paper Sensitivity of Atomic Analysis by X-rays. Laby went on to have an x-ray spectrograph of his own design manufactured by Adam Hilger Ltd. (see cat. No. 38). School of Physics, the University of Melbourne Cat. No. 22. Jacqueline Eager Student Projects Placement, Cultural Collections 2005 The original X-ray tubes relied on low pressure operation. The electrons and positive ions are produced in the residual gas. Positive ions are accelerated towards the cathode and release electrons which on hitting the anode produce X-rays. These early gas X-ray tubes operated satisfactory only over a narrow pressure range. Manufacturer’s mark stamped: “PATENTED/ VICTOR/ TRADEMARK/ MADE IN BOSTON U.S.A./ TUNGSTEN” A white circular stamp, stamped near the manufacturer’s mark: “[illegible]TER WIGGH[illegible]” Stamped label: “NAT. PHIL. LAB./ No./ UNIV. OF MELB.” Inscription on the end face of the copper piece: “PAT. SEP 5’ 11 DEC. 30’13/ JUNE 23, 14 NOV. 30.15/ 43835”

Assembled, cast. Stenciled. Accessories: dials. Surface finish: coated. Paper label adhered with tape: “SUSPENSION BUST?” Stamped label: “NAT. PHIL. LAB./No17/UNIV. OF MELB.” Inscribed on rim: “H. TINSLEY & Co/LONDON. S.E./No9722

Dip circle has much the same elments as in the previous model ( cat. no.81), except the brass cylinder is replaced by a mahogany box with two end windows. Tribrach base is fixed into a wooden sheet ( maybe for ease of carrying in the field).Label: “Nat Phil Lab No. Univ. of Melb” Magnets inscribed “Magnets for dip”

Brass cylinder attached to black enamelled iron round stand by knobs. Catalogue article in display case to accompany object. (text in bad state of disrepair) (Addendum: Original text has been photocopied; thus replacement copy is placed with instrument, original confined to file)Engraved on cylinder: “Negretti & Zambra, London Jordans Photographic Sunshine Recorder No. 194”. Label: “Nat. Phil. Lab. Univ. of Melb.”

Brass cylindrical optical element erected on wooden rectangular base. Label on base: “Nat. Phil. Lab No. Univ. of Melb”

Vernon Harcourt’s Standard Pentane Lamp, consisting of the following components: 27.1: Wooden hinged box with key 27.2: Glass Pentane lamp 27.3: Metal clamp attachment 27.4: Empty glass bottle 27.5: Glass bottle stopper 27.6: 1.5 CP weight 27.7: 1 CP weight 27.8: Small metal bullet 27.9: Instruction sheet Miscellaneous: 2 screws to be reattached to lamp green small piece of glass small flat rectangular piece of metal cotton woolLabel on front of box (27.1): “1K5”; “Natural Philosophy Laboratory No. University of Melbourne” Label on inside of box (27.1) “Negretti and Zambra Opticians Meteorological Instrument Makers to the Queen To the Prince of Wales The Royal Observatory Greenwich The British Meteorological Society Admiralty, Board of Trust, Royal National Lifeboat Institution. Holborn Viaduct. 45 Cornhill. 122 Regent Street & Crystal Palace London” (emblem also included on label). Plaque on lamp (27.2): “Nat. Phil. Lab No. Univ. of Melb.”; “Vernon Harcourt Standard Pentane Lamp No. 2. Made by Woodhouse & Rawson Electrical Manfg Coy No. 4590” Label on clamp (27.3): “Nat Phil. Lab. N. Univ. of Melb” Moulded on glass bottle (27.4): “4 oz” Inscribed on weight (27.6): “1.5CP” Inscribed on weight (27.7): “1 CP”