Channing, William F.(William Francis),1820-1901 · Boston : Thomas Hall · leaf 29
expose again the brightsurface of the zinc. When the plate is only tar-nished, or slightly coated, it will be found difficult toeffect the removal of the deposit, and it may beallowed to remain, without cleaning, until furtheruse. The wires which convey the current to theelectro-magnetic apparatus,… … with, the battery in Fig. 3. It consists, in itssimplest form, of two concentric helices of wire, andin tlie axis of both, a rod of soft iron, or a numberof iron wires. The current from the battery passes ELECTRO-MAGNETIC APPARATUS. 21 through the inner helix, which is of coarse, insulatedcopper…
Electrotherapy · Medicine, Physical · Electricity
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