Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 174
return spring shall be checked.This is done by means of a spring balance as shown in Figure 26. The reading shall betaken just as the contact tongue leaves the back contact. The tension of the armaturereturn spring is regulated by means of the spring adjusting screw. Loosen the lock nutand turn the… … Fig. 25 Fig. 26 Page 2 Section 5-A Adjustments Multiplex System 263-C
Telegraph
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