Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 175
LOCK NUTSCONTACT SC*£W Fig. 27 Fig. 28 Page 3 Section 5-A Adjustments Multiplex System 263-C 9. Main Break Contact Adjustment. The main break contact screw (Fig. 28) shall be so adjusted that a pull of four ounces at the extreme end of the main break armaturewill just open the contact points. 4.0CK…
Telegraph
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