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 438
bove andquitting it at C by a contact-breaker, consisting of aapiing tipped with platinum resting against the platintun 412 ELEMENTARY LESSONS ON [chap. xii. tip of a screw, from which a return wire passes back tothe zinc pole of the battery.. As soon as the lever isattracted forward the circuit is… … Fig, 167, again establishmg contact at C, whereupon the hammeris once more attracted forward, and so on. The pushP is shown in section on the right of Fig.-167. Itusually consists of a cylindrical knob of ivory or porcelaincapable of moying loosely through a hole in a circularsupport of porcelain…
Electricity · Magnetism
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