Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 94
. Selecting Bar Unit Position. Set the selecting bar unit by means of the screwswhich hold the cradle base in place so that the punch block connecting levers are verticaland so that the character projections on the key levers will properly select their combi-nations. 7. Selecting Bar Lower Stop.… … 8. Selecting Bar Springs. The selecting bar springs shall have a tension of 40 to45 grams when stretched to an overall length of 1 5/8 inches. This adjustment shallbe made before the springs are assembled on the bars. 9. Punch Magnet Contacts. Adjust the punch magnet contacts so they will justclose…
Telegraph
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