The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 525
ity of two perma-nent magnets. This avoids danger of reversal of polarity fromlightning, a trouble incident to the old system. 520 STANDARD ELECTRICAL DICTIONARY. The cut, Fig. 322, shows a single needle telegraph instrumentof the tapper form. The action of the tapper can be understoodfrom the next…
Electricity
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