We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Proposed Revisions, PH22.17, — .36 and — .58 Related to 8mm and 35mm Low-Shrink Film and Aperture for 35mm Sound Motion-Picture Projectors
THREE PROPOSED REVISED American Standards are published on the followin] pages for three-month trial and criticism. All comments should be sent to Henry Kogel, SMPTE Staff Engineer, prior to October 1, 1953. If no adverse comment are received, the three proposals will then be submitted to ASA Sectional Committee PH22 for further processing as American Standards.
The basic change in PH22.17 is one which makes allowance for the further decreas of the shrinkage characteristics of safety film. This question arose first in the review of the two standards on 16mm Film Dimensions, PH22.5 and PH22.12. The re visions made in those standards, and reasons therefor, are virtually the same a for the present revision of this 8mm standard. Refer to Dr. Carver's statement, in the December 1952 Journal, p. 527, for the Committee's detailed thinking on thi subject.
On PH22.36, only a minor revision is involved, affecting the method of indicatin; dimension G. This new method provides for the measure of both the linear anc angular misalignment of any pair of perforations and brings this proposal in accorc with international practice.
In reviewing PH22.58, the Film Projection Practice Committee came to the con elusion that the camera centerline should be deleted as well as dimension H whicl specified the 6-mil differential between camera and projector centerlines. The 6-mi differential was originally inserted to make allowance for film shrinkage so that the release print, after shrinking its normal amount, would have the image centered in the projector aperture. The decrease in the shrinkage characteristic of film elimin ates the need for this differential, and now permits the use of the projector apertur centerline for both the projector and camera. In addition, the corner radius ha been decreased to be in accord with present practice of essentially square corners. — H.K.
726 June 1953 Journal of the SMPTE Vol. 60