Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 22
. The characters which represent the letters of the alphabet, etc., are made upof a number of these signals. 21. In the Multiplex System five keys and five electromagnets are used in combina-tion for making each character. 22. Let us consider an arrangement such as shown in Figure 10. Here we have… … 23. By depressing one or more keys, any one or more of the electromagnets may beoperated. In this manner it is possible to make all the combinations shown in Figure11. To make the letter A, electromagnets 1 and 2 are energized by closing keys 1 and 2;to make the letter B, electromagnets 1, 4 and 5…
Telegraph
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