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
electricity is pass-ing, in a heap of iron filings, we find thatthe filings adhere to the wire. This experi-ment, and those with the electro-magnet,and the deflection of the magnetic needleby an electric current, cannot fail to con-vince us that an intimate relation exists be- 36 TELEGRAPHY. tweerv…
Telegraph
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