5 Physical Demonstration Instruments, c. 1920 onwards

5 Physical Demonstration Instruments, c. 1920 1) "Mammoth" X-ray air-cooling tube with regeneration device, made by Cuthbert Andrews, England, length 20 in. - 2) Crookes cathode ray tube, for demonstr

2 Large Physical Demonstration Instruments, c. 1880 1) "Electrical Egg", for the demonstration of an electrical discharge between two electrodes in a near vacuum, original lacquered brass, height 25 i

2 Physical Demonstration Instruments, c. 1900 1) Aluminum plate electrometer by A. Pichler's Wwe, Vienna. Brass, height 10 ½ in. - And: 2) Ohmmeter by Chauvin & Arnoix, Paris. No. 696, in wood c

Group of Scientific Instruments Physical demonstration models and others: 5 various Crookes cathode ray tubes, 1 x-ray tube (defective), 15 glass valves, 4 stands, 3 Leyden jars, 2 glass tubes with me

4 Physical Demonstration Tubes, c. 1910 1) Crookes tube, for demonstrating a magnetic altering the direction of radiant matter, length 13 1/3 in. – 2) Tubular magnet coil, height 10 1/5 in. – And:

Electro-Magnetic Motor with Rotating Geissler Tube, c. 1915 Physical demonstration model, height 9 7/8 in., tube length 10 1/5 in., good condition, untested. Elektromagnetischer Motor mit rotieren

Ceramic medical instrument holder. Doulton stamped. Issued: 1920 c. Dimensions: 8.5"H Manufacturer: Royal Doulton Country of Origin: England

Telefunken Single Audion Box Type ED222, c. 1920 With RE11 Audion valve, wooden case, size only 5 ½ x 6 ¼ x 3 1/6 in., an auxiliary instrument to use in order with detector receivers. Telefunken-Zus

4 Physical Demonstration Instruments 1) Tesla generator, 6 in. primary coil, 2 in. secondary coil, with spark gap, pillar 33 ½ in. high. - 2) Wimshurst's electrostatic machine, 2 Leyden jars, 2 plast

1 Electric Motor and 2 Measuring Instruments, c. 1920 1) Small electric motor, 220/240 V, 1/90 hp, 2000 rpm, with belt drive. - 2) Siemens & Halske, ampere meter, 0-30 A, Ø 4 1/3 in. - And: 3) Ampere

Attractive Shellac Jazz Disc Collection, c. 1920 onwards 78 rpm, with following artists: 16 x Lionel Hampton – 3 x Wolverine Orchestra – 1 x Ted Weems – 1 x Al Hall Quintett – 6 x Pee Wee Hunt

Group of Early Triodes and other Electron Tubes, c. 1920 onwards Triodes: Ader, 2 x Metal TM, Philips, Philips E, Replica R70, Philips M and 2 unmarked tubes (silvered interior). – Other tubes: Blu

ART DECO 14KT WHITE GOLD DIAMOND SAPPHIRE RING (MISSING ONE SAPPHIRE), SZ. 9.5, C. 1920, W. 4.0 GR.

Antique 14K white gold filled diamond ring, single diamond (0.25 ct), geometric metal details, size 7.5, c. 1920, unmarked Provenance: Property from the estate of life-long antique jewelry collector

Group of Physical Demonstration Models, c. 1900 1) Wimshurst's influence machine, Trüb, Fierz & Cie., Zurich, height 14 ½ in., complete, rubber straps need to be renewed. - 2) 8 chromic acid

Large Dynamo-Electric Demonstration Machine, c. 1920 With maker's plaque: "Pleskot & Spol, Presna Mechanika, Praha". Handcrank-driven, large chain armature, on oak base, overall size 15 x 11 x 13 ¾

4 Interesting Physical Demonstration Models, c. 1900 1) Ebert's phosphorescent lamp with 2 electrodes. – 2) Crookes' apparatus for experiments on radiant matter. – 3) Crookes' radiometer. – And:

4 Physical Demonstration Models, c. 1910 1) Reflection and refraction apparatus by "Max Kohl, Chemnitz". – 2) Filament lamp on wooden stand. – 3) Voltmeter by "Radiguet à Paris", brass. – And:

2 Physical Demonstration Models, c. 1910 1) Crookes' radiant matter tube, height 16 ½ in. – And: 2) Winkelmann-type vacuum double bulb, 1 glass tip broken, height 15 ¾ in. 2 physikalische Demonstr

6 Physical Demonstration Models, c. 1910 1) 2 Leyden jars, height 15 and 20 ½ in. – 2) Discharger, with 2 ebonite handles and hinge. – And: 3) 3 conductors on glass pillars, one by Robert Droste

motorcyclist, lithographed sheet metal, 17.5 cm, c. 1920, clock mechanism is intact, used German Description Motorradfahrer, Blech lithogr., 17,5 cm, ca. 1920, Uhrwerk intakt, bespielt

3 Electro-Physical Demonstration Models, c. 1915 1) Stand with 2 copper spirals separated by a glass cylinder, with an incandescent lamp, height 13 in. - 2) Kolbe's electrometer, aluminum, standard b

"The Struggle Creates (produces) Heroes"; 9.5" diam. C. 1920. Rear has hammer, sickle and cog underglaze mark in back. See photo of similar example photographed in "Kunst und Revolution" (Art & Revolu

in original box, dated, very good, box good, 5 pieces, (c. 1920)