An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 120
peated oveiand over again as long as the electric circuit is complete at thepush button. The back-and-forth motion of the armaturecauses the clapper to strike a succession of blows on the gongand thus produces the ringing of the bell. When a bell getsout of order, the trouble is usually to be found… … Fig. 54. — Electric bellwith vibrating stroke. I 98 • ELECTRICITY AND MAGNETISM Sometimes it is not desirable to have an electric bell ringcontinuously while the push button is depressed, and in thatcase the spring contact C is omitted, and the conducting wiresare connected directly with the…
Electricity · Magnetism
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