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tory sound up to about 8,000 cycles at ordinary levels of volume.
As for the more rapid frame rates proposed for 3-hole film, their advan¬ tages lie chiefly in the direction of flickerless pictures and less heating of the emulsion by the arc-lamp beam. In fact, 48 frames-per-second prints made from 24 frame/sec. negatives might be very serviceable in drive-in theatres to prevent blistering of the emulsion.
The changes needed in 35mm projec¬ tion equipment for running 3-hole film are not extensive. Old-style projectors can “get by” with nothing more than a substitution of 12-tooth sprockets for the regular 16-tooth sprockets (with corre¬ sponding readjustment of the pad rollers and gate-door intermittent-sprocket shoe) ; but this simple method should not be considered as a permanent ex¬ pedient. Film-wrap around 12-tooth sprockets is not entirely satisfactory.
The ideal conversion of a projector to 3-hole film involves the substitution of a suitably geared intermittent movement employing an 18-tooth sprocket (six 3hole frames per revolution) and reduc¬ tion of a motor-soundhead drive gearing to % of the present standard RPM to allow use of present sprockets in mech¬ anism and soundhead. The problem is a simple one from the point of view of the mechanical engineer. END
PIcto-scope*
NEW TRIPLE-PURPOSE AN AMORPHIC LENS
PROFESSIONAL SUPER-PRO
LIST $80.00 LIST $100.00
PICTO-SCOPE anamorphic lenses will work on any 16mm or 35mm motion picture camera, on 16mm projectors and 35mm slide projectors. Excellent for color or black-and-white pho¬ tography. PICTO-SCOPE is compatible with CinemaScope. Write for full information.
♦Trade-mark.
THE PICTORIAL CO.
2910 Broad Street • New Castle, Indiana
Film Editing Made Easy with NEW
professional film viewer
for 16mm film
Every film editor will appreciate a viewer that enables him to view his film from left to right — on a large, brilliantly illuminated screen.
The Professional Film Viewer makes film editing a breeze. Easy threading, portable, will not scratch film. Put this viewer between your rewinders and speed up your editing. Size of Viewing Screen 6"x 4".
Price— $350 Counter additional $100
Telephone: JUdson 6-1420
American Cinematographer
August, 1956
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