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74
KNAPP
Vol 49, No. 1
precisely the lateral position of the film. A double pair of rollers at entrance and exit was found necessary to flatten the film properly as it passes through the focal plane. Tests showed, however, that this construction alone was not sufficient to ensure complete flatness of the film under all conditions since a slight lateral curvature tended to persist. The only successful method yet developed of eliminating this curvature has been through a rough control of the humidity by use of humidifying pads in the magazine. Fig. 5 is a side view of the camera showing the loading door. The opening and closing of this door also moves interlocking pins which operate the light locks so as to prevent accidental exposure of the film.
Fig. 6 shows the external view of the film magazine. It will be
noted that it seems disproportionately large compared to the size of the camera. This is, of course, because of the fact that the film is laced as an endless belt in the magazine. Fig. 7 (a) and (b) shows the external construction of the film rack with the film laced in place. The run on which the film enters and leaves the camera is a straight vertical run, whereas most of the others are diagonal. The alternate use of large and small spools on both the upper and lower shafts eliminates the possibility of the film's touching and rubbing on the crossover points. The shaft which carries the lower set of spools is loaded both by gravity and by an auxiliary spring in order to secure the desired film tension. The film lacing shown in Fig. 7 utilizes the maximum capacity of the magazine. This lacing can be modified to accommodate shorter lengths in case a fullFIG. 6. External view of film magazine, length film strip is not necessary.
FIG. 5.
Side view of camera showing loading door.