2 Magnetic Demonstration Models, c. 1915

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

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

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

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

Tesla Coil Demonstration Model, c. 1915 With label: "Elektro Vulkan, Kromeriz", circular wood base, inner coil on porcelain isolator, outer coil on 3 glass columns, height 15 ¾ in., Ø 10 1/5 in.,

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 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

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

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:

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:

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

Electrophysical Demonstration Model, c. 1890 France, marked "HRFA", mahogany, thick-walled glass container (fixed to the base), 6 electric connections, 2 coils, 2 electrodes inside of the glass, one s

Early Radio Receiver, c. 1925 Demonstration model, ebonite plate, 2 tubes (RE134, A408), Audio Frequency Transformer Type R-12, plug-in coil, swivel coil, variable capacitor, 2 potentiometers, size 3

Lot (3) YGF Pocket Watches; Elgin YGF HC 12S 7j Grade 301 model 2 Pocket Watch, stem wind and set, SN 18423691, c 1915, runs when wound; Waltham YGF OF 12S 17j Model 1894 pocket Watch, stem wide and s

Edison Phonograph and Edison Dictating Machine, c. 1915 1) Edison Standard Phonograph, 2/4-minute cylinders, model H reproducer, with repeating function, oak case with lid, aluminum horn, no crank, w

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

4 Telephones 1) Ericsson table phone, model 381, original handset, demonstration model without tin cover, c. 1902. - 2) French candlestick telephone by A. Burgunder, with second earphone by Unis Fran

Early boxed World War I telescope, "B. C. Telescope Model 1915 A1". Box 54" x 10 1/2" x 12" Ht.

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

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

Electro-Magnetic Motor with Rotating Geissler Tube, c. 1890 Physical demonstration model, two electro-magnets, on wood pillar, with wood and brass holder and original Geissler tube, for creating a daz

Ampère Table, c. 1900 Physical demonstration model, used for experiments on the relationship between magnetic fields and electric currents, probably France, with pole changer, overall height 15 3/4 i