. The Bell System technical journal . on of each exposure is controlled by thefilm speed and by the angular height of a fixed aperture in front ofeach of the four faces of the cube. The film sprocket is directly drivenfrom the motor shaft. Spur gears are employed to drive the opticalcompensator. A separate motor is employed to drive the take-upreel. 16 millimeter film in hundred foot lengths is used. A finder is provided which permits viewing the image on the filmas projected upon a ground glass screen mounted on the hinged doorof the camera. Lenses of various focal lengths are interchangeable
. The Bell System technical journal . on of each exposure is controlled by thefilm speed and by the angular height of a fixed aperture in front ofeach of the four faces of the cube. The film sprocket is directly drivenfrom the motor shaft. Spur gears are employed to drive the opticalcompensator. A separate motor is employed to drive the take-upreel. 16 millimeter film in hundred foot lengths is used. A finder is provided which permits viewing the image on the filmas projected upon a ground glass screen mounted on the hinged doorof the camera. Lenses of various focal lengths are interchangeableon the front of the camera. The camera is mounted upon a sub-stantial tripod and is readily portable. Figure 2 shows the exteriorof the Bell Telephone Laboratories high speed camera. Figure 3shows the interior of this camera where the location of the film spoolsand main drive sprocket are shown. Figure 4 shows the camera withits two motors and portable lighting units of the type developed for HIGH SPEED MOTION PICTURE PHOTOGRAPHY 397. Fig. 2—High speed camera used in taking 4000 pictures per second.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
