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 122
that account. The mechanism of bells and pushbuttons is very simple and not likely to get out of order, but troublemay occur even in them. The contact parts in a push button gradu-ally become corroded, and then when the button is pushed it does notcomplete the circuit. This fault is easily remedied… … Diagram showing circuit for ringing two bells from one push button Fig. 56. — Diagram of electric-bell circuits. exhausted, and the battery becomes polarized or run down. Thebell then fails to ring when the button is pushed. If the battery hasno depolarizer, the process of running down occurs in…
Electricity · Magnetism
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-713-416.webp)
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-478-298.webp)
