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216 SOUND MOTION PICTURES
and light portions of the sound track after it has been developed. When the sound film has been exposed it is developed until the record is opaque.
When both the picture itself and the sound track are finally completed both are placed in contact in the printer, together with regular stock positive film, and the positive print results. In this developing process each film has a starting mark by means of which the two are threaded in the printer in correct relation to each other, to insure synchronism.
VI. Lighting
The lighting used for the making of pictures at the sound studios is similar to that employed for regular motion picture work, and this is a good thing for the industry; for it is well known that picture making has to its credit the perfection of a splendid development in lighting. It would be unfortunate if the advantages gained through experience had to be discarded because of a novel venture. In instances it has been found necessary to quiet down the operating mechanisms and in some cases to change the reflectors in the Cooper-Hewitt lamps in order to prevent sound reflections. In some circumstances incandescents are being used. Since they are noiseless, these lamps are preferable to arc and mercury lights. There is very little doubt that with experience in this field of the work improved lighting equipment and panchromatic film will help solve some of the noise problems.
At the present time new Klieg lights have been developed that furnish brilliant and evenly diffused light, high in actinic quality. They permit photographing with clearness of detail and good colour value and yet are free from sound interference, besides being noiseless in their own operation. These include long-beam, high-intensity flood