Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 105
etterwith its corresponding figureFig. 19. and preparatory sign to be visible at any one time. An electroscope, consisting of apair of pith-bills attached by means of threads to a metalsupport in connection with the hne wire, was suspended infront of the latter disc. The transmitting apparatus… … THE STORY OF THE TELEGRAPH. 93 The transmitter and receiver at each station were exactlysimilar. When it was desired to send a message fromeither end, the outer disc was turned so as to exhibitthe letter A with its corresponding numeral and pre-paratory sign, which, in this case, stood for the word…
Electric industries · Electricity
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