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MOTION PICTURE PHOTOGRAPHY
The ease or difficulty with which the film may be threaded through the camera has an important bearing upon its usefulness. As a rule, a camera of a straight line threading, that is one in which there are no twists in the film in its passage through the camera, is the simplest and most desirable. On the other hand, the more compact models, in which the retorts are placed side by side, cannot be threaded without a twist in the film.
The general rule for threading the camera is as follows :
Place the feed retort in position.
Pull out as much film as is needed to thread the camera.
Pass the film over the feed sprocket and open the gate.
Place the film smoothly between the side guides with the emulsion towards the lens.
Close the gate carefully and latch, leaving a loop of film between the feed sprocket and the upper portion of the gate large enough so that pulling the film down in the gate for six perforations will not draw the loop taut between the sprocket and the top of the gate, and yet not so large that the loop will strike any portion of the camera mechanismi.
Then leave another similar loop at the bottom of the gate.
Carry the film around the take-up sprocket beneath the rollers, through the light trap in the retort to the spool in the take-up sprocket and the take-up spool.
Fasten the cover of the take-up magazine.
Give the handle a turn to see that the film is feeding through properly and close the camera.
The film in the feed retort must be wound so that when the retort is in place the film is threaded properly, the emulsion side of the film in the gate toward the lens. In straight line threading the loop is not a true loop but only a slackness in the film to provide for a quick downward movement of that portion of the film within the gate when it is dragged down by the claws.
In cameras with the magazines side by side a true, or return, loop must be made in the film between the feed sprocket and the gate and between the gate and the take-up sprocket. Types of the double return loop threading are found in the DeBrie, Pathe Portable and Newman & Sinclair cameras.
The Prevost, carrying its magazines side by side on top of the camera, is an exception, the feed magazine being directly above the feed sprocket and gate, feeds downward in a straight line
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