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April, 1930] NEW SIXTEEN MILLIMETER CAMERA 435
dial on the outside of the camera case is, for the sake of simplicity, graduated only for the speeds of 8, 12, 16, 24, 32, 48, and 64 picture frames per second. The constancy of the camera speed has been obtained through exacting calculations of the length, weight, and tension of the driving spring and through the above-mentioned instantaneous action of the governor.
An oiling system is provided so that all moving parts are automatically lubricated while in operation. Oil holes are conveniently placed and are easily accessible. The governor oiling system consists of an especially designed oil reservoir with felt filling, which is in constant contact with the worm gear and which supplies a continuous flow of fresh lubricant on the governor worm. The capacity of the oil reservoir is calculated so as to insure proper lubrication for a considerable length of time.
It is quite obvious that in a camera operating at as high a speed as 64 picture frames per second, the problem of securing a positive start and stop of the mechanism, in order to avoid differences in exposures during these periods, and the total loss of picture frames, would present some serious difficulties. These problems were solved by devising a unique system of stop pawl and recoil spring, controlled by the camera operating button, which insures a positive start of the mechanism at the desired speed and an equally positive stop at all speeds.
At the moment that the camera release button, C, is pressed down, the stop pawl, D, disengages from the recoil springs, S, allowing the mechanism to function at the speed controlled by the governor. The instant the operating button is released, the stop pawl engages the recoil spring, the weight and tension of which are so calculated as to minimize the shock of sudden arrest. The action of this stop control, added to the instantaneous action of the governor, eliminates the possibility of even the slightest appearance of either acceleration or deceleration.
In presenting this new camera to the public, the Bell & Howell Company feels confident that it will stimulate a further interest in amateur cinematography the world over.