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Coat your own
MAGNETIC SOm
By D. F. CHIMINO
Thousands of movie fans have discovered the thrill, and pleasure, with spooling and processing their own films. But to these same thousands, the advent of "magnetic sound" on 16mm (or 8mm J film subtracted from the enjoyment of completing the job from filming to screening by introducing the necessity of sending each completed roll of film to some striping laboratory.
In an attempt to make available to all cine fans iron oxide striped films at but a fraction of the cost now charged by striping labs ($3.50 per 100 feet) and to restore the amateur to his original status the method described herein was devised. Realizing that the magnetic coating must be one of very uniform thickness to make possible a good recording, a transfer process was developed in which the uniform coating found on ordinary sound recording tape is transferred to the film. In this manner any amateur can do a professional job of striping right in his own home. — D.F.C.
THE general nature of the Transfer Process is depicted in the above sketch ( Fig. 1 ) . The oxide surface of plastic-packed recording tape is brought firmly into contact with the base surface of the film by the motor driven rollers, contact being made along the soundtrack edge of the film. At approximately one inch before the contact point of film and tape, a thin layer of Eastman Kodak film cement is applied to the sound-track edge of the film. (As an alternative, the cement may be applied to the tape I .
Eastman Kodak film cement serves admirably in loosening the coating from the back of the tape and makes the oxide adhere more strongly to the base side of the film than it does to
the plastic backing of the tape itself, the entire process being facilitated and dependent on the squeegee action of the rollers. (The action of the Eastman Kodak film cement is practically instantaneous.)
Precautions — To bring about a transfer of the iron oxide from the recording tape to the cine stock, three factors must be controlled, i.e.. the quantity of cement applied, the rate at which the tape is brought into contact with the cemented sound-track edge of the film and the pressure with which the tape is pressed against the film.
The above factors are controlled as follows in the apparatus used by the
• See MAGNETIC on Page 156
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