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274 RICHARDSON'S BLUEBOOK OF PROJECTION
change-over cue appears on the screen operate the dowser.
Checking Synchronism
(79) The standard release may be used for checking synchronism. Any variation in the size of the loop between the projector and sound head aperture will destroy synchronism.
When the start-frame is threaded over the aperture and the loops are of correct length, there will be a diamond mark over the sound aperture. The diamond mark is located twenty frames in advance of the startframe. (80) For perfect synchronism examine the location of the diamond mark at every threading. Turn the flywheel until the right motor-start frame is over the aperture. Experience will enable the projectionist tc judge the loop size very accurately.
Upkeep of Standard Release Print
(81) Projectionists who take pride and interest in their work will do nothing to diminish the effectiveness of the standard release print. Every frame cut away for one reason or another reduces its usefulness in the projection room. With the general use of the 2,000foot reel there will be little occasion to manhandle the release print. Remember that it is 100 per cent effective only so long as it remains in its original condition and occupies its original position with relation to the beginning and end of the reels.
Standard 2000-Foot Reel Specifications
The essential specifications given for the standard 2000-foot reel approved by the Research Council of the Academy of Motion Picture Arts and Sciences, and adopted as of September 1, 1936, are as follows:
Outside diameter,, \Ay2 inches. Hub diameter, 4 inches. Free inside width, iy2 inches. Flanges (sides) must be of No. 24 gauge (0.25-inch). Hub must be of No. 20 USS (0.0375-inch) gauge. Rib heights shall
THIS BOOK IS THE PROPERTY
OF
BARNET ENSIGN LTD.,
WALTHAMSTOW. E,