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

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THE FILM 197 there in the first place either through the carelessness of some projectionist somewhere or by the refusal of a theatre management to make necessary projection equipment repairs. {73) Some projectors have a slight oil leakage from the intermittent oil well. Unless the projector parts are badly worn and need immediate replacement, the projectionist, by exercising a little care, can keep the oil from reaching the film. It is generally done by a wiper located between intermittent sprocket and the oil well. It is not an easy thing to set up, but many projectionists have done it successfully. Standard Release Print (74) The change-over cue in standard release prints consists of a black dot printed in the upper right hand corner of four consecutive frames of every print, the first of which is located 22 frames from the end of the picture — provided no frames beyond it have been eliminated in doubling up or in making a splice. On light backgrounds the black dot serves, but on dark backgrounds the black dot is or should be surrounded by a thin white line in order to make it more visible. (75) In locating the change-over cue 22 frames from the end it was assumed that approximately one-half second would be consumed in operating the dowser when the cue showed up on the screen. If the change-over is to be perfect it is essential that there be no delay. The projectionist must act instantly when the cue appear > on the screen. (76) The projectionist may help himself to spot the cue marks by setting up a pad of paper near the observation port and during the first projection of the day make note on it of the action just preceding the cue in each read, "Girl approaches well," which is enough to enable the projectionist to locate the cue mark for an exact change-over. The Motor Cue (77) The cue to start the idle projector motor con