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1 Electric Motor and 2 Measuring Instruments,...
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2 Electric Motors, c. 1920...
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Electro-Magnetic Motor with Rotating Geissler...
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Electro-Magnetic Motor with Rotating Geissler...
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Early Electromagnetic Motor, c. 1860...
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Large Jointless Induction Coil According to R...
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Van de Graaff Generator and Wimshurst's Elect...
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5 Physical Demonstration Instruments, c. 1920...
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5 Physical Demonstration Instruments, c. 1920...
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4 Physical Demonstration Instruments...
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Ducretet Mercury Interrupter, c. 1900...
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6 Physical Demonstration Instruments, c. 1920...
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5 Physical Demonstration Instruments, c. 1920...
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Electric-Powered Mercury Interrupter, c. 1920...
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Group of Scientific Instruments...
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Very Large Holtz-Type Influence Machine, c. 1...
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Electrotechnical Laboratory Devices and Acces...
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Very Large Wimshurst's Electrostatic Machine,...
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Physical Demonstration Models, c. 1900...
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Complete Apparatus for Experiments with High ...
