Physical Demonstration "Gyroscope" Model, c. 1880

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

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:

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

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

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

Tellurium and Lunarium by Ernst Schotte, Berlin, c. 1890 Physical demonstration model, 1:163 million scale, bronzed cast metal and brass, with hand-turned mechanism, the sun as a candle without reflec

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

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.

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

Electromagnetic Motor with Geissler Tube, c. 1900 Physical demonstration model, for tubes up to 6 in., overall height 8 in. Elektromagnetischer Motor mit Geißler'scher Röhre, um 1900 Physikalisches

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

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

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

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

High-Voltage Apparatus after Tesla, c. 1980 Large physical demonstration model, with spark gap, height 23 in. Hochspannungsapparat nach Tesla, um 1980 Großes physikalisches Demonstrationsmodell, m

Collection of Physical Demonstration Models and Technical Devices 1) Carbon arc lamp, demonstration model by John Browning, London, original lacquered brass, 2 graphite electrodes, one height-adjustab

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.,

Bell Telephone Demonstration Model, c. 1900 Manufacturer: E. Leybold's Nachfolger, Coeln-Rhein. Open-works telephone model for demonstrating the mechanism, on mahogany base, very good original condit

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