F. H. Richardson's bluebook of projection (1935)

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198 RICHARDSON'S BLUEBOOK OF PROJECTION sists of a black dot exactly the same as the change-over cue, printed on the upper right hand corner of four consecutive frames, the first of which is twelve feet and six frames from the end of the picture. (78) This distance enables the projectionist to make due allowance for variable speed of pick-up in different motors. The slowest may use almost the whole distance between the motor and the change-over cue marks. Every projectionist should test his motors and make the necessary allowance. (79) Since the motor start cue is twelve feet and six frames from the end of picture, at 90 feet per minute this would consume approximately eight seconds of time. The problem is to ascertain just how many feet of film each motor, starting from dead position, will pick up in eight seconds, since that will be the actual motor-start footage for that particular projector, and must be considered when threading up. In other words, if the first projector picks up in eight feet, you must thread with the motor-start frame four feet and six frames past the aperture. If projector No. 2 only picks up twelve feet and six frames in the same interval, then you must place the motor-start frame over the aperture. To Ascertain Motor-Start Footage (80) In an empty theatre, place the footage frame marked No. 11 over the aperture. With one projector working, start the other the instant the motor-start cue appears. Operate the dowser the instant the changeover cue comes through. Should there be a lapse on the screen between the two reels, try again, this time placing frame No. 10 over the aperture; continue the operation until you have found at exactly what point the effect is perfect. This indicates exactly what frame to place over the aperture each time you thread that particular projector. To avoid error by the relief men it is best to record the pick-up data on a couple of gummed stickers in some visible spot on each projector mechanism. (81) Except for change in voltage (which does