TWO-MOTION SELECTORS
The same sort of numbering scheme can be provided on a step-by-step basis, by a different type of electromechanical switch called a two-motion selector. The principle is illustrated in Figs. 38.7 (a) and (b). The bank of fixed contacts now contains 10 semi-circular arcs, each having 10 contacts, and arranged above each other. The moving contact or wiper can be connected to any one of the 100 bank contacts by first moving vertically to the appropriate level, and then rotating horizontally to a particular contact on that level. The 100 outlets are numbered from 11 to 00. The diagram symbol used to illustrate the 100-outlet two-motion selector is shown in Fig. 38.7(c) .
As with the uniselector arrangements, the two-motion selector ...
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