Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 179
Fig. 35 21. Drum Switch. Figure 36 shows the drum switch mounted on the selector. Thesmall casting, which carries the lever controlling the contacts, may be rocked by looseningone adjusting screw and tightening the other and thus the contact gap can be varied.Loosening the lower screw and… … A.PJUST/NG \ UNOPE/eATEP Fig. 36 drum in its unoperated position, the adjusting screws shall be regulated so that the drumswitch contacts stand open .010 inch. 22. Function Contacts. The function contacts can be regulated in the same manneras the drum switch. When adjusting the function contacts,…
Telegraph
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