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lj?2 THREE-DIMENSIONAL MOTION PICTURES (3) Allen set screws on selsyn motor are straight. With projector positions synchronized as above, the selsyns are energized by plugging in the AC plug of the electrical cable that connects them. The projectors will now remain synchronized. If the position of one is changed by hand, the selsyns will automatically make the same change in the position of the other; in opera tion, if either motor lags the selsyns will pull It ahead. (When the theatre is closed down at night the selsyns are de-energized by unplugging the cable.) PROJECTION ROOM CHANGES Aside from installation of the interlock, whether mechanical or electrical, the following changes are necessary in all projection rooms; The regular drive motors are wired to a common switch so they will start and stop together. If these motors are not switched simultaneously a serious strain would be thrown on the interlock system. The 24" magazines are installed. If the projector pedestal interferes with the Installation of the lower magazine, the latter must be offset for clearance. A wedge for this purpose must be made up in a local machine shop. The twin images of the third-dimension screen image are displaced on the screen by exactly the proper distance only if projector alignment is perfect. To obtain this condition of alignment, short loops are made from the test film furnished, and projected simultaneously, projection light is reduced to a minimum to prevent warping of the film. The projectors are then realigned until the two sets of lines projected from the two test loops superimpose perfectly. If absolute perfection cannot be obtained It is at least necessary to make certain that lines from the left projector stay to the left of lines from the right projector. A reversal would