Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 92
es the cord to be wound up -on the drum and move the pointerwhich is fastened to the cord along the scale on the face of the indicator. 21. When sixty-five characters have been perforated a cam on the ratchet wheelcloses the lamp contact springs, thus lighting a small lamp located on the left hand… … Fig. 7 22. Whenever the CAR RET key is depressed it operates the indicator return lever,which engages the holding pawl on the indicator and pushes it away from the ratchetwheel. The cord immediately unwinds and the pointer is returned to zero. 23. Since the CAR RET key may not be depressed long…
Telegraph
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