Handbook of projection for theatre managers and motion picture projectionists ([1922])

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870 HANDBOOK OF PROJECTION FOR Weaver Douser AN ELECTRIC DOUSER.— The change-over is facilitated by what is known as the Weaver Electric Douser, which works by magnetic action and cuts off the light from one projector, substituting that of the other simultaneously, or at least in the very small fraction of a second. The action is in fact so rapid that it is practically instantaneous. Figure 363-A. In Fig. 363-A we have the photographic view of the douser, and in Figs. 363-B and 363-C wiring diagrams for two and three-projector installations. It is also quite possible to add other switches, so that the douser may be set into action from any desired point in the projection room, though this latter we