Electromagnetic machine in wooden case, containing 2 batteries and induction coil with sliding outer coil, made by K. Schall, 76 New Cavendish Street, London, England, c. 1900.
overall (open): 360 mm x 395 mm x 140 mm, 2.7481 kg
overall (closed): 180 mm x 290 mm x 140 mm, 2.7481 kg
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