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1144 HANDBOOK OF PROJECTION FOR
The sound track itself is .070 of an inch wide, so that the light beam covers its entire width and overlaps on either side by .0075 of an inch. It is essential that this be so, for the reason that when using a variable area sound track such as is illustrated in Fig. 385, page 994, if the entire track width be not covered by the light beam, then some of the higher or wider peaks would not be illuminated throughout their entire length, with result that sound quality would suffer, The projectionist may test the side location of the light beam as per directions on page 1059, reporting any error found to the Service Engineer.
SLIT LOCATION. — The projectionist is warned not to meddle with the slit assembly. Its location is a matter for microscopic adjustment, which cannot be properly done by the projectionist. However, it is essential to excellence in results that the slit be so located that the beam of light will, at the point where it meets the film sound track, have its width precisely at right angles to the sides of the sound track. If this be not the case — if the light beam be in any degree out of position in this respect — it will cover or "cut" more than one of the recorded lines simultaneously, with consequent distortion of the sound. Moreover, unless the light beam be properly focussed at the sound track there will be injury to the quality of the sound.
Should the projectionist suspect the above described condition to be imperfect, he must not himself attempt to effect a remedy, but immediately notify an RCA Service Engineer, all of whom are supplied with the instruments necessary to the making of a competent test and a correct adjustment.