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1060 HANDBOOK OF PROJECTION FOR
nue at 54th Street, New York City, or from RCA Photophone, 411 Fifth Avenue, New York City. Certainly it may be had from the Eastman Company, Rochester, N. Y.
This film will look just like the white leader and trailer used on positive prints, but that sort will not do at all. You must have negative stock.
Having obtained the film, just thread it into the sound gate as you would a positive print, with the emulsion side toward the light, and close the exciting lamp switch. Let the light from it shine on the stationary film while you slowly count ten, then turn the projector flywheel so as to move the film the fraction of a sprocket hole, and again let the light shine upon the stationary film while you count ten. Repeat this, say, half a dozen times.
Remove the film and, examining the same carefully, you will find a series of tiny lines at the portion which passed over the sound gate aperture (you must look closely to see them). They will be the imprint of the image of the slit. You will do better if you use a condenser lens or other magnifying glass to make the examination. You may now see just where the slit image registers sidewise, and by cutting off a bit of sound film and comparing by laying it on the test strip, with sprocket holes perfectly matched, you may know whether or not the slit image is correctly centered sidewise.
WARNING. — Should you start projection and discover you have no sound because you have not lit the sound lamp, don't light it until you have first retarded the fader to zero. Then light it and gradually advance the fader to its normal setting. Should you snap on the