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Nov., 1943] INSTRUMENT FOR MEASURING FILM WIDTH 399
instantly a direct reading or recording of film width in millimeters. Thus, with but one moving part in the actual measuring mechanism, variations of film width are measured in a fraction of a second, and the most minute changes are amplified to a degree allowing clear and easy reading, without injury to film from pressure of the mechanism.
Mechanical Construction. — Fig. 1 is an oblique view of the electronic width gauge, showing the important mechanical features of design. Film 1 passes from the feed roll, under guide-roller 2 through the measuring head under the second guide-roller 3, and to the take-up roll which is driven by a motor, not shown. Guide rollers, measuring head, and spindles for the film rolls are all constructed so that 8-mm, 16-mm, or 35-mm films can be measured interchangeably.
The measuring head consists of the fixed lateral film guide 4 which is adjustable for any standard width of cine* film, the ballbearing film-supporting roller 5, and the movable lateral filmguide 6 which is attached to the swinging lever, with the movable condenser plate attached to the lower end. The immovable lateral film-guide 4 can be adjusted for different widths of film by lifting the lateral positioning-pin 7 and moving the film-guide 4> until the proper space separates it from the other film-guide. Then, by lowering the tapered positioning-pin into a tapered hole, the guide 4 is firmly locked in position. This tapered design of the locking mechanism insures the same positioning of the fixed lateral film-guide whenever it is adjusted to measure film of any particular width, regardless of intervening adjustments for other widths of film.
As the film passes through the measuring head, it is curved over the ball-bearing film-supporting roller 5. The path described by the film in passing over this roller forces it into a partially cylindrical contour at the point of measurement, thereby inducing lateral rigidity and assuring that the true width of the film will be measured. This simple method of film-guidance is one of the prime factors insuring accuracy and reproducibility of readings with the instrument.
The zero-set button 8 (Fig. 2) is used for adjustment of the instrument, if necessary. Depression of this button, against the tension of the return spring 9 shifts the movable condenser plate 10 to a definite predetermined position in relation to the fixed condenser plate 11. When condenser plates are separated by this predetermined distance, the lever and movable film-guide are in a position corresponding to that which they would occupy if a film were of