Notes on electricity and magnetism. designed as a companion to Silvanus P. Thompson's Elementary lessons (1891)
Murdock, J. B. (Joseph Ballard), 1851-1931, Thomson, Silvanus Phillips, 1851-1916 · New York, Macmillan & Co. · leaf 144
D MAGNETISM. 131 83. American System of Telegraphy* (§ 426). The European system is known as the open circuit system, the current flowing only when the key is depressed.Many inconstant cells like the Leclanche may, therefore,be used. In America, however, the current flows continu-ously when no… … Fig. 33-—Key. telegraphing the switch must be closed or no signals canbe made by any other operator on the line. The generalappearance of the American key is shown in Fig. 33. Thekey is fastened to the table by the screws B and L, theformer being insulated from the metal of the key, thelatter in…
Electricity · Magnetism
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