We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
04
CINEMATOGRAPHIC ANNUAL
Bell if Howell Super-speed Movement A — Film Feeding Fingers. D — Back Plate. E — Aperture Plate. F — Check Pawls. G — Side Tension Adjusting Bar. H — Floating Rail. I — Stationary Rail. K — Drive Gear Housing. This mechanism can be operated at as high a speed as ZOO frames per second. The registering of the film is secured through the action of the check pawls. The side-tension system frees the film-surfaces from friction. When used for sound work, three pairs of feeding fingers are eliminated, and the steel driving gear replaced by a fibre one.
thus obtained reduces to a minimum the possibility of marring the film with abrasion markings or scratches.
The advent of sound pictures demanded that the motion picture camera should be silent in operation so that the mechanical noises resulting from the functioning of its rather complex parts would not be "picked up" by the sensitive microphone.
It is quite obvious that an intermittent movement, especially when working at the comparatively high speed of 24 pictures per second, which is the standard speed for pictures synchronized with sound, is likely to produce clicking noises. Sound pictures had such a meteoric success that mechanical engineers were caught almost unaware. The pressure of demand put them under the obligation of making the best out of an undesirable situation and of facing the new exigencies to the best of their ability. Fortunately, however, the precision of design and manufacture which had been reached prior to the coming of sound pictures made it possible to adapt the existing mechanisms to silent operation with considerable success. The superspeed movements were silenced to a considerable degree by changing the steel gears for fibre ones which eliminated the well known and peculiar noises produced by two metallic gears in contact. The fixed rate of speed of 24 pictures per second being far less than the speed