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78 A. S. HOWELL AND J. A. DUBRAY [J. S. M. P. E.
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tions, and if we consider a speed of 24 pictures per second as the standard, the length of sound record registered per second would be 570 mm. as compared with 456 mm. for the standard film*of 35 mm. width, or an increase of 1.25 times.
Again, the possibility of varying the width of the sound record for further possible developments is apparent.
Both these dimensions, "Extreme" and "Spectacular," and especially the first, would involve, if accepted, considerable expense due to the necessity of bringing about entirely new developments in the different apparatus in use in motion picture production, film processing, and exhibition.
This reconstruction of apparatus would involve complete redesigning of perforators, cameras, printers, developing machines splicers, and all other minor laboratory apparatus, as well as require a reconstruction of projectors, involving extreme developments which could not be devised and put into execution before a considerable length of time.
The "Extreme" proposed dimension, especially, would also present not a little difficulty in the solving of the problems pertaining to film shrinkage and to the evident necessity of maintaining the films in a perfectly flat position at the critical operating point, or area, in all motion picture apparatus.
We would suggest that unless the "Extreme" dimension perfectly meets the sound recording and reproducing requirements not only at the present stage of development, but with due consideration to future possible developments, it should be considered only with a good deal of caution and forethought.
The "Spectacular" dimension, though requiring considerable mechanical engineering development, would nevertheless present some distinct advantages which may compensate for the expense of time and capital involved.
We shall now review the dimensions of the "Economic" proposal which are shown in Fig. 9.
The proposed height of the picture is 18.29 mm. for the camera aperture and 17.26 mm. for the projector aperture. The height of camera aperture is equal to the same dimension standardized for the 35 mm. film and corresponds, therefore, to the sum of the pitch of four perforations less a dividing space 0.71 mm. in width. The proposed width of the camera aperture is 30.76 mm. and the proposed width of the projector aperture, 28.76 mm. For the same