Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 110
equired to depressthe key is too small, the spring must be spread, and vice versa (Fig. 11). Make sure thatthe key levers move freely at the pivot and in the guides without sticking. A simplemethod of adjusting the tension of a number of these springs to approximately the samevalue is to set their… … ■■■■■II ^ LOOPS- Fig. 11 KEY LEVERSPRING
Telegraph
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