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1949 HIGH-SPEED PHOTOGRAPHY 443
An automatic switch within the camera is preset to cut off the current supply at the end of a run. This switch may be set for either a 50 or 100-foot length of film. A synchronizing switch can be set either to open or close an external circuit at any time during a run. This supplementary circuit permits the subject being photographed to start ahead of, simultaneously with, or after the camera has begun to operate. When the camera is operated on 60-cycle current, a built-in argon lamp flashing 120 times a second exposes this number of traces along the edge of the film. Accurate determination of the speed at any instant during a run can be made by counting the number of frames between two consecutive traces and multiplying by 120.
The Kodak high-speed camera uses a telescopic type of view finder wherein by looking through the eyepiece it is possible to compose and focus the image directly on a piece of matte-surface film which is inserted in the aperture.
In the case of the Fastax cameras, of which there are three, an 8-mm 10,000-picture-per-second camera, a 16-mm 5000-picture-persecond camera, and a 35-mm wide-angle 3500-picture-per-second camera, the film-loading situation is comparatively simple. The Fastax is loaded by placing the feed spool on the feed spindle, pulling about a 12-inch length of film off, and pulling the knob on the holddown roller out, and then moving that assembly upward on its axis counterclockwise. The film is then placed on the sprocket with the perforations in engagement with the teeth. Care must be taken to be sure that the film is inserted between the timing lamp and the sprocket teeth properly and not in interference with the timing lamp. The free end is then placed into the take-up spool, the take-up spool placed on the take-up spindle, and the slack taken out of the film. The door is then closed and the camera is ready to be operated. The Fastax camera does not require a starting resistor for the two motors on the camera which are rated at 120 volts. One motor drives the sprocket and prism assembly while the other motor drives the take-up spindle. When starting, the take-up motor has a tendency to run a little faster than the driving motor and consequently the film is kept under tension and assistance is given the driving sprocket with this tension that exists. The acceleration is such that the motors cannot be started above 150 volts without ripping the film.
A 4-sided prism is used for the 16 and 35-mm Fastax cameras and an 8-sided prism for the 8-mm Fastax camera. In the case of the