Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 303
DOOOOOOOO 0000600000 OOOOOOOQQQ is ■y^7vvvv1^Jvvfvlv,vfvfy!vlvlvfvjvlv,^ .n.rt.fi M rt 1*1 r*i ft rh rh f^i.r^r^tt/irt/r*i_A rh rt hf k «8 r- cq … Page 21 Section 7 Multiplex System 263-C hence the position of the sending plug need never be changed. This plug can thereforebe left in its normal position with the index pin opposite socket No. 1 at all times. 37. In order to make it possible to back up the sending distributor by operating…
Telegraph
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