HIGH SPEED INTERMITTENT CAMERA.

The article reports that the Rapid Selector as originally built was not completely satisfactory because of the complexity and expense of the mechanism required for satisfactory reproduction of frames of 61 meter which were close together on the master film. The problem is one of removing an exposed frame of takeoff film after the two microsecond flash, and before another flash comes along to spoil the images by double exposure. However, some 11 frames pass in one-thirteenth of a second, and if two or more of them were on the same subject multiple exposures on one frame would result.