Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 41
a greater change in the frequency than permitted bythe use of the sliding weights, adjustment of the removable weights must be resorted to.These cannot be moved without stopping the fork. Three sets of these weights arefurnished with the multiplex fork, by means of which any fork frequency, from… … Fig. 2 11. Figure 2 shows the construction of the La Cour wheel. The armature is madeup of laminations of silicon steel firmly riveted together between two brass end plates.The electromagnetic field is produced by four sets, or pairs, of magnets, the cores andyokes of which are made of laminated…
Telegraph
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