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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 ...
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Japanese Mariner's Compass, c. 1850...
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Tellurium and Lunarium by Jan Felkl, Prague, ...
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4 Large Physical Demonstration Instruments, c...
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Large Geissler Tube with Uranium Glass Flower...
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Large Crookes Fluorescent Tube and Radiometer...
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Large Crookes Fluorescent Tube, c. 1910...
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2 Large Physical Demonstration Instruments, c...
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4 Large Physical Demonstration Instruments, c...
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4 Large Physical Demonstration Instruments, c...
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5 Physical Demonstration Instruments, c. 1920...
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5 Crookes Electronic Tubes, c. 1920...
