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1174 HANDBOOK OF PROJECTION FOR
(d) The projectionist must monitor or test his records Jbefore attempting to use them in his show. This is done as follows: Place record on turntable in the manner shown in Fig. 430. Set needle at starting mark. Bring fader up to its normal operating position and start projector, counting the number of turntable rotations and fractions thereof before sound starts. Exact counting will be made the more easily if a bit of white paper be placed under the record edge opposite the starting mark. Using a China Marking Pencil, mark each record with the required number of turns as per the count. The records are now ready for use in the regular rehearsal.
In theatres where managers class the first show as "rehearsal," use the following method to mark records: If it requires about five seconds for a projector to attain full speed, it then follows in that time the turntable and record have made one and one half (lj4) revolutions, and about four feet of film has passed the projector aperture.
In the same time, however, since at full speed (90 feet of film per minute, or \y2 feet per second) seven and one-half feet of film has passed the aperture of the other projector, therefore after having tested the record and found that, for example, it requires three complete revolutions from starting mark for sound to start, it is safe to rotate the record one and one-half (lj4) revolutions from the starting point, thus leaving iy revolutions to permit projector reaching full speed before sound starts. Therefore mark the record, using a red "china marking pencil," iy, which means you are to place needle on starting point of that particular record and operate the projector by hand until the record has rotated \y2 turns.