Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 269
cams to their normal position and the main contact operating lever thenpushes the tongue of this contact against its front contact again and thus restores thecircuit to the transmitter magnet. 7. Let us now refer to Figure 3, which shows the electrical circuits of the auto controland its… … Fig. 2 LLLLU III III
Telegraph
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