Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 155
Fig. 4 7. Attached to the shaft D is a long lever C which is slotted at its upper end. This slot engages a pin A on its associated interference plate and controls the rotation ofthe plate between its two extreme positions which are determined by a slotted lug onthe plate (Fig. 5). … Fig. 5 Page 3 Section 5-A Multiplex System 263-C 8. Each of these plates is perforated with a different combination of holes and onthe periphery of the upper portion of each are cut various combinations of notches. Themovement of one or several of the plates to the operated position will either…
Telegraph
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