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FIG. 1 — Bell & Howell 202 magnetic-optical sound projector mo'difled for projecting picture with separate sound film. Author Joe P. Gray (seated) explains system to interested onlooker.
FIG. 2 — Gray holds auxiliary takeup unit which is attached to front of projector. Case encloses motor that drives the takeup belt working from a friction-clutch pulley.
FIG. 3 — Interior of the 202 projector showing altered film threading pattern. “I" is added spring-mounted idler; "M”, loop of magnetic film which by-passes the picture film gate; and “F", the magnetic sound film as it proceeds to the takeup.
A SOlilMD SYSTEM FOR SIXTEEN-MIVI
By JOE P. GRAY
Photos by Ralph Y. Grubbs
I SHALL NEVER forget boriiig a hole in the case of my hrand new Bell & Howell 202 sound projector!
Hut it was for a good cause — an important ste.p in a plan I had conceived to utilize my magnetic-optical sound pro¬ jector in a unique way. The plan involves the use of sprocketed 16mm magnetic /i/m as the recording medium as opposed to the use of film pre or post-striped for sound.
Magnetic film is extensively used today hy film makers in all fields of motion picture production because of its excellent recording characteristics and particularly because of the several conveniences it embodies. Second and even third-generation dupes of magnetic film recordings possess such excellent quality they are often difficult to distinguish from the original. This quality has encouraged the practice of post-mixing sound from several tracks to form a compos¬ ite track for the picture.
Sound quality of high professional order is within the reach of the average free-lance 16mm film maker, provided
FIG. 4 — Author's complete projector modification is shown in this diagram. Path of the 16mm sound film is indicated by the heavy broken line, and that of the picture film by the solid lire. Permanent additions to the projector mechanism are the idlers “A". “B' ord "C”.
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AMERICAN CINEMATOGRAPHER