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Scientific American, Vol. 97, No. 26 (1907) (1907)
leaf 10
n of the shaft, and can thus The operator would thus see that the circuit had to go along with the wheel, and by sending the other complete a circuit which includes the spark coil of failed to work. As regards the position of these sig- sparks at each contact the cam makes a whole revo- the… … The Automatic Telegraph Apparatus. © 1907 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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