Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 93
o. 23. Since the CAR RET key may not be depressed long enough to permit the ratchetand drum to complete its rotation back to the zero point, the holding pawl is providedwith a safety latch, which engages the holding pawl, and holds it away from the ratchetwheel until the indicator has returned to… … Page 1 Section 4 Adjustments Multiplex System 263-C ADJUSTMENTS 1. General. Before adjusting, the apparatus shall be thoroughly cleaned, examinedfor mechanical or electrical defects, and a thin film of oil applied to all bearing surfaces. 2. Comb. Push the front comb down, and secure it with its…
Telegraph
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