Telegraphy and how to learn it; with brief chapters on elementary science, embracing various kinds of electricity, electrical measurements, thermo-frictional electricty, batteries, magnets and magnetism (1901)
Frederic, Wilson. [from old catalog] · Chicago, The Henneberry co · leaf 39
FIG. 10 as if they were only different manifesta-tions of one and the same agent. By suspending two copper wires (Fig.10), each 50 cm. long, and about 5 mm.apart, with their lower extremities dippingabout 2 mm. into mercury, so as to move MAGNETS AND MAGNETISM. 37 with little resistance either…
Telegraph
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