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88
W. C. MILLER
Vol 44, No. 2
This could be of value in a semipermanent stationary application. Sound Track. — The equipment as supplied records unilateral variable-area sound track conforming to the nominal 35-mm standards with respect to track dimensions and location on the film. As previously suggested later adaptations can be made to produce other types of track as desired. When 35-mm film is used the track is the same as any 35-mm recording using track of this kind. When 16-mm film is used (see Fig. 19) the track dimensions and location
with respect to the adjacent film edge remain the same as for 35-mm film. This choice for the 16-mm film was made to permit the use of 16-mm film on 35-mm reproducing equipment without changing film location, optical systems, etc. It is relatively simple to replace sprockets and rollers in most 35-mm reproducing heads with 16mm sprockets and rollers having the same approximate diameter dimensions, thus permitting the machine to run the 16-mm film at 90 ft a min very satisfactorily.
It is the expectation that practically all material recorded with this equipment will normally be rerecorded. In view of this it makes little difference whether the original film is wide or narrow, except for possible editorial difficulties, if the original sound quality is that obtainable with wide film standards.
Modulator. — The modulator now used in the equipment is the E. M. Berndt Corporation Auricon-type galvanometer mounted in a special housing as shown in Fig. 20. Noise reduction amounting to 6 db is attained by a d-c bias of the galvanometer movement. This galvanometer was adopted because of its generally rugged construction and simplicity of operation. Arrangements are made for
FIG. 19.
Sound track dimensions — 16and 35-mm film.