Motion picture projection; an elementary text-book (1921)

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54 MOTION PICTURE PROJECTION These switch arms are connected by two hinged or pivoted connecting members, the inner ends of each of which are pivoted to one another, while their opposite ends are connected to the respective switch arms. The inner ends of each of the connecting members are provided with projecting stops, each arranged to engage the opposite member and thus limit the stroke or extent of rotation of either switch arm relatively to the other. In order that the invention may be readily understood, reference is directed to the accompanying drawings, which show by way of example, a switch constructed according to the invention, in which: Figures 1 and 2 are. front elevations of part of a & switchboard showing the switch arms for the two sets of resistances in varying positions. Figure 3 is a part and elevation of Figure 2 seen from the left. The switchboard 1 is provided with two sets of