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434
JOSEPH A. DUBRAY
[J. S. M. P. E.
new design, which permits accurate variations of speed from 8 to 64 picture frames per second, and at any of the intermediate speeds.
A worm, W, of hardened and polished steel, which is an integral part of a shaft, A , has its teeth angularly cut so as to properly engage into the teeth of the driving gear, G. The shaft is mounted in an adjustable hardened steel bearing with a ball thrust. Four weights, B, each mounted on a spring, C, are permanently fastened to the worm shaft.
The speed of rotation is controlled by the sliding outer housing, D,
A CAMERA
APERTURE
B SHUTTER &
CAM ASSEMBLY
C OPERATING
BUTTON
D STOP PAWL
E GRAVITY LATCH
S RECOIL SPRING
DIRECTION OF ROTATION OF SHUTTER
FIG. 9. Stop control of the Filmo 70-D camera.
which regulates the tension of the springs, C, by means of the flexure control collar, which is rotatably mounted in the housing, D, and is controlled by the speed control dial on the outside of the camera case.
In the figure, position 1 of the case, D, corresponds to a speed of 8 picture frames per second; position 2, to a speed of 16 frames per second; and position 3, to a speed of 32 frames per second. If the sliding case, D, is set at the end of its allotted path, the camera mechanism will feed the film at the maximum speed of 64 picture frames per second. The action of the governor is instantaneous. This extremely important characteristic permits the use of high speeds without sacrificing the feature of securing a positive stopping of the camera while the shutter is in its position of occultation.
While the governor can be set for any desired speed within the range of from 8 to 64 pictures per second, the setting and indicator