Student Potentiometer (Type D-73-E) set in wooden box with lid. Black control panel with various dials:two for VOLTS & MILLI-VOLTS; others for galvanometer sensitivity, battery rheostats, etc. 24.1 = potentiometer 24.2 = lidPlaque on front of box: “J.L.William Scientific Instruments Serial No. 1480. Type D-73-E Melbourne Australia”. Inscribed on control panel: “J.L.William Scientific Instruments Melbourne Australia. Various control panel markings.

Planimeter consisting of brass disc and measuring instrument made of white disc and attached bar. To measure area up to about the size of one A4 page. The instrument is stored in a black hinged box with purple velvet lining and small metal catches. Instruments instructions are attached to a label on the inside of the case. A small key is attached to the case lid by string. (23.1 = box, 23.2 = brass disc, 23.3 = planimeter)On planimeter (23.3): “G.Coradi Zurich Switzerland No. 3509” On box (23.1): “Nat. Phil. Lab. No. 1199, Gebr Wichmann Berlin”

Copper magnetron with disc-like body has three radiating electrodes each emerging through a copper to glass tube. Two of these are arranged on one side(= filament leads) and the other larger tube (collector/anode) is arranged diametrically opposite.Handwriting on top “?A4 A98/4.9%”

3 cm dia oxidised copper cylinder held in construction jig (consisting of two flat square steel slabs clamped with bolts). Three copper through glass electrodes radiate out from the magnetron cylinder. Two of these tubes are small and adjacent to each other (filament leads).

Copper cylinder to which radial copper vanes are brazed defining twelve resonant cavities. Central cylindrical cavity contains white oxide coated cathode sandwiched between two stainless steel disks, one at each end. Three electrodes pass through glass-copper seals, the copper tubes are attached radially to the outside of the cylinder.

Chrome cylindrical neutron counter. Length approx. 1 m.“H7100 - 700246” painted on inside end of tube.

Glass Geiger counter ready for evacuation. For details see No 15.

Cylindrical glass Geiger counter tube, inner surface (cathode) partially covered in evaporated gold.“IE29”

Black cylindrical galvanometer with circular base standing on three legs.Embossed: “Leeds and Northrop Co. Philadelphia PA”, “652978”, “Zero Adjuster/Coil Clamp”. Labels: “Part 2”, “Supplied by A.W. Dodds Pty Ltd, 612 Collins Street, Melbourne MU 6786”

7 flat discs (battery like) with diffraction gratings (55.1-55.7). surface rectangular rulings extend mostly 15mm . stored in specially converted metal hinged cigarette box (55.8) with wooden compartments

Clear glass tube, about 50 % completed by glass blower towards Geiger counter construction.

Short glass Geiger counter tube with evaporated gold cathode.

As for Cat. 58 demonstrating GM Tube prior to evaporation of cathode.

Boron Triflouride neutron proportional counter. Long glass tube covered in black enamelCello taped label: “20th Century Electronics” “Type G.60 Operate at 1250 Volts No. KK854” “Made in England”

Glass donut with injector arm and attached wires. Internal surface is sand blasted and silver plated. Mounted on specially made demonstration stand. Reg 269.6 is photographs of the object.Plaque on mould: “Glass Donut for 2.8 MEV Betatron W.B.Laish and L.Riddiford 1946”

Certificate of Examination for #64 of one 6 inch glass scale, one 6 inch steel scale, and one 6 inch end gauge for Professor Lyle. 3 page document (copy) from National Physical Laboratory, Teddington. Paper held together with pin. (See also #63)

U.S. Bureau of Standards Certificates for #65 for 6 inch steel scale, 6 inch steel end measuring rod, 6 inch glass scale. Three Department of Commerce Bureau of Standards certificates submitted by Professor Lyle for scales made by H.J. Grayson. Held together by paper clip. (See also #62)

(1) Glass rectangular scale (1-(1)-6 inch); (2)ditto steel rectangular scale, (3) ditto metal cylindrical rod. Enclosed in black hinged box with purple velvet lining. 64.1 = steel scale, 64.2 = glass scale, 64.3=steel rod, 64.4 = box. See#62 “National Physical Laboratory Certified Standards”On top of box labels: “Length Standards 3BA”, “National Physical Certified Standards 1.6 inch steel scale. 1.6 inch glass scale, 1.6 inch rod. For particular see certificate 1915” “40 6”. On glass scale engraved: “13.0 cNP” Engraved on steel scale “H.J.G. Melb Univ. 1915 ruled at 12.9 Celsius” . On glass scale engraved: “H.J.G. Melb Univ. 1915” “1,2,3,4,5,6”. (H,J,G, = Henry Grayson)

#S 66&67 CONSTITUTE A SET Brass cylindrical optical element erected on wooden rectangular base. Engraved on barrel: “Husbands Optician. Melbourne & Bristol”. “scale”. “90” on barrel near scale.

Brass cylindrical optical element erected on wooden rectangular base.

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

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

Glass rectangular slab consisting of 11 glass plates “welded together”. Slab is concave and squashed on top. Base shows two black lines. An early attempt to manufacture bulk optical glass.

Glass rectangular slab consisting of 15 plates “welded/squashed together”. Slab is concave at top. See no 70 for details.

Rectangular galvanometer made of black enamelled metal. Made in Melbourne, Australia by JL WilliamPlaque on front: “Direct Current Galvanometer Resistance 65 ohms, critical resistance 1100 ohms, sensitivity 1250mm/ma, Instrument No. 441.5.JL. William Melb. Aust.”

Metal hollow vessel with glass insert opens at one end. At opening metal round plate is perpendicular and has brass cylinder attached.

Polished metal cylindrical X-ray dosimeter stored in red rectangular cardboard box. 26.1 = box 26.2 = dosimeterEngraved on dosimeter: “C1948” On box: “C.K. Dosimeter”;”Sole Distributors Cinema Television Ltd Lower Sydeham London S.E.26”

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”