Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 121
Fig. 3 SELECTING MAGNETS … Fig. 4 Page 3 Section 5 Multiplex System 263-C 10. In the center of the drum or hollow shaft about which the slotted discs move isa vertical shaft carrying a light typewheel. This shaft is kept under tension by a spring,wound at required intervals by a small motor. Projecting at right angles from…
Telegraph
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