Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 466
s theair from reentering the sys-tem of tubes. The mercurymust be carefully guardedfrom dust, dirt and moisture.462. The Induction CoiL—A thick wire capable ofcarrying a large current iswrapped in a coil around abundle of soft wires. Out-side this, and carefullyinsulated from it, is a… … Fig. 184. the primary circuit is rapidly making and breaking th^ circuit, a simple formof which has been described on page 369. Of thesebreaks or interrupters many ingenious types have beeninvented, among which those using a contact of mer- CHAP. XIV.] ELECTRICITY AND MAGNETISM. 441 cury and a…
Electricity · Magnetism
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