2 Physical Demonstration Models, c. 1910

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

2 Physical Demonstration Models with 9 Geissler Tubes, c. 1910 1) Stand with turning star and 3 tubes with uranium spirals. – And: 2) Isolated stand with 6 tubes of different shape and color, 2 of t

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

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 Dynamo-Electric Machines, c. 1910 Physical demonstration models, 1 by Masquellier, Anvers, handcrank-driven, cast-iron wheels, on wooden boards, heights 12 ½ in. and 16 ½ in. 2 dynamoelektrische M

Ampère Table, c. 1910 Physical demonstration model, used for experiments on the relationship between magnetic fields and electric currents, originally with mercury filling, with 2 plaques: "Instrumen

Large Electro-Magnetic Motor with Rotating Geissler Tube, c. 1910 Physical demonstration model, height 18 ¼ in., for tubes of up to 15 3/4 in. length, brass and steel, on walnut base, later tube, ve

Electric Motor with 10 Geissler Tubes, c. 1910 Physical demonstration model with rotating Geissler tubes, on brass pillar and walnut base, height 7 ½ in., with 10 tubes of various shapes and colors.

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

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:

3 American Steam-Engine Demonstration Models, c. 1910 1) Cast-iron model of a railroad locomotive engine, reversible, with Stephenson steering, hand-cranked, width 18 ¼ in. - 2) Steam motor, cas

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

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:

Group of Vacuum Tubes, c. 1915 Physical demonstration models. 1) Geissler tube lighting up by friction, length 19 1/3 in. – And: 2) 10 various Geissler tubes, 2 of them liquid-filled, some uranium

Tellurium and Lunarium by Jan Felkl, Prague, c. 1880 Physical demonstration model, signed on the earth globe: "Die Erde, Prag bei J. Felkl, No. 1", bronzed cast metal and lacquered brass, 2 1/3 in. pl

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

Electric Motor and 2 Armature Models, c. 1910 1) DC motor, open construction, cast-metal housing, 3 belt drives, height 4 ¾ in. – And: 2) 2 Leybold armature models, 1 x double T armature and 1 x d

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

4 Demonstration Model Electric Motors, c. 1910 Various models and constructions, height up to 7 in., untested. 4 Demonstrationsmodelle Elektromotoren, um 1910 Unterschiedliche Bauformen und Konstru

2 Electrostatic Induction Demonstration Models, c. 1900 Glass balls with hanging gold strips, conductors on the top, height 7 ½ and 9 7/8 in. 2 Demonstrationsmodelle "Influenz-Elektrizität", um 1900

BECKER 2 pieces, drive model, c. 1910, carpenter at plane and saw, smith, 2 men at anvil, sheet metal, handpainted, restored, height: 11 and 14.5 cm German Description BECKER 2 Teile, Antriebsmodell,

Adix and Certa Adding Machines Pallweber & Bordt, Mannheim, Germany. 1) Adix model 2, c. 1910, attractive 3-digit adding machine with 9 keys, pre-clearing model, aluminum baseplate, in original velvet

2 Adix Adding Machines Pallweber & Bordt, Mannheim, Germany. 1) Adix model 2, c. 1910, attractive 3-digit adding machine with 9 keys and 10-addition bracket, pre-clearing model, aluminum baseplate, in

Pair of Ericsson Intercom Telephones, c. 1910 2 model BC1300 units, serial nos. 1286995 and 1057805, for batteries, cradles with switches, single bells, handsets with speaking horns, on walnut boards.