A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 526
Fig. 535 Single-Needle Telegraphic Apparatus. signals transmitted are received by observingthe movements of a vertical needle over adial. … Fig. 536. Wheatstone and Cookes Single-Needle Appa-ratus, Internal Arrangement. Movements of the top of the needle to the right of the observer represent the dashes, and move-ments to the left, the dots of the Morse alpha-bet. The single-needle apparatus of Wheatstone andCookes system is shown in…
Electricity · Electrical engineering
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