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PACE 236
HOME MOVIES FOR JUNE
• Fig. I — A method that offers synchronized sound for 16mm. home movies and certain to increase in popularity is that which provides sound track on separate film. Both sound and picture films are threaded together in sound projector as shown here. A is picture film; B is sound film. Both are kept in synchronization through interlock at lower sprocket. Otherwise, films travel separate paths.
Dual Film System Offers Low M Sound For Hi mm.
w . c . CARLE
Courtesy American Photographic Publishing Co.
• For The Advanced Amateur
SOUND on disc, sound on wire, sound on film — all these offer an answer to the amateur's demand for sound for home movies. Of the three, sound on film has proven the most satisfactorv, but because of its cost or the
inability of many amateurs to record on film themselves, it is the least used by the non-commercial movie maker.
However, there is a method by which sound on film may be employed for 1 6mm. movies that does not involve
the cost nor the duplicating of the original film that usually follows in a commercial sound film production. Simply stated, the method consists of recording the sound on film in synchrony with the picture, but instead of combining sound track with the film in a final duplicate print, the sound track film is developed to a positive and then projected simultaneously with the picture film, being threaded together with it in the projector.
There are many advantages in this unique system. First, for the lecturer who desires to project his original Kodachrome films in order to bring to the screen color in its highest fidelity, a sound track on film can be provided without need for duplicating the picture film. The usual loss in color quality that often follows present methods of duplicating color film is thus avoided.
Second, the cost of a dupe print is saved; the only charge being that for recording and processing the sound track film. Still another advantage is that a silent film, for which an independent sound track is made, can still be screened with, a silent projector whenever necessary.
Here is the way it works: The picture film is on one reel and the sound track film on another. To project the picture with sychronized sound — music, dialogue, sound effects, etc. — the two films are threaded into the sound projector, as shown in the illustrations. The picture film is not threaded completely through the machine, but travels directly to an auxiliary take-up reel after leaving the lower take-up sprocket.
• Continued on Page 256
• Fig. 2 — Diagram shows method of threading sound and picture films in Bell & Howell "Commercial" sound projector. I is picture film supply reel; 2. film gate; 3, picture take-up reel; 4, sound film supply reel; 5, sound drum; and A. sound film take-up reel.
• Fig. 3 — Threading diagram for Ampro models X and Y sound projectors, showing paths of travel of sound and picture films. I is picture film supply reel; 2, film gate; 3, picture take-up reel; 4, sound film supply reel; 5, sound drum; 6, sound film take-up reel.