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CHECKING SOUND TRACK DIMENSIONS 119
(9) Negative sound track width (fully modulated) : the width of a fully modulated variable-area negative sound track is 0.060 in. This width is symmetrically disposed about the sound track center line specified above. (Eef. : ASA-Z22.41.)
(10) Projector scanning beam for sound track: the Btandard projector scanning beam for sound is 0.071 in.; this too is symmetrically disposed about the sound track center line of 0.058 in. Note that the scanning beam width is greater than the negative sound track width; the purpose of the dimensional difference is to allow for the various errors in placement and in weave that will occur in all machinery used between the original sound record and the release print derived from it. (Eef.: ASA-Z22.41.)
(11) Printed area for sound track of a release print: the standard printed area for printing a sound release print from a variable-area negative is 0.080 in. (minimum) ; this area is symmetrically disposed about the 0.058 in. center line. Additional printing area is permitted toward the picture, up to 0.012 in. The relations between these dimensions are shown in ASA-Z22.41. Note that the printer aperture width is greater than the scanning beam width of the projector; the purpose of this dimensional difference is to allow for the various errors in placement and in weave that will occur in all machinery used between the original sound record and the release print derived from it.
(12) Direct positives — picture and sound: it should be noted that although the formally adopted standards for the picture portion of the film have taken direct positives into account in addition to negatives, no standards have yet been adopted that take into account direct positives of sound. Only sound by means of negative-positive processing has been anticipated up to this point. The guiding rule for sound effectiveness is: "Will the finished product — the print — project properly in a standard 16-mm projector?" Just as long as that is accomplished, the objectives of the recording, printing, and processing processes are being attained.*
Checking Sound Track Dimensions
Introduction
The checking of dimensions on motion picture films can clear up many practical difficulties that might otherwise remain quite obscure. With a knowledge of current standards and with relatively simple test apparatus, such as the Bausch and Lomb Shop Microscope mentioned previously, most dimensional difficulties arising from the picture and its handling can be readily tracked down. Since sound and its handling often seems somewhat more obscure to many people, a more detailed treatment of the checking of sound-track dimensions seems worthwhile.
If sound is to be recorded satisfactorily, it must be recorded correctly with respect to dimensions. This means that aperture widths, aperture locations, and film weaves must be checked. Sound originals should
* Data on new arrangements that are in use but have not been standardized should be promptly transmitted by anyone interested to the Engineering Secretary of the Society of Motion Picture Engineers at 40 West 40 St., New York, N. Y., for suitable consideration in connection with standardizaton.