Journal of the Society of Motion Picture Engineers (1930-1949)

The following three standards (two revised standards and a new proposal) were approved by the Film Dimensions Committee and are now being reviewed by the Standards Committee. PH22.5, Dimensions of 16mm Silent Motion Picture Film, PH22.12, Dimensions of 16mm Sound Motion Picture Film, and PH22.93, Dimensions of 35mm Low Shrink Camera Raw Stock Film The periodic review of standards has brought four standards up for consideration and it was agreed that three should be revised : Z22. 17-1 947, 8mm Film Dimensions, Z22.31-1946, Definition for Safety Film, Z22.36-1947, 35mm Positive Film Dimensions ; and the fourth reaffirmed: Z22.37, 1944, 35mm Raw Stock Cores. Film Projection This committee is simiPractice larly reviewing four standards and here it was also agreed that one should be reaffirmed : Z22.4-1941, 35mm Projection Reels; and three revised: Z22.29-1946, Projection Rooms and Lenses, Z22.35-1947, 35mm Sprockets, and Z22. 58-1 947, 35mm Projector Aperture. In addition several dormant projects, "Projection Room Plans," and "Arc-Lamp Mounting Dimensions," were discussed and plans made to reactivate them. Finally, the desirability of standardizing the Society Leader from both a television and a theater point of view was mentioned and initial action in that direction approved. Films for This committee was largely Television responsible for the development of the Television Test Film. Much thought was given at this meeting to ways and means of further improving it and changes may be expected in the near future. Standardization of the Society Leader was discussed at this meeting also. As was mentioned in the May 1951 Journal, this leader was developed by the Leader Subcommittee, chaired by Charles Townsend. It was designed to keep the basic features of the Academy Leader required by the theater projectionists while adding useful information required in projecting films for television. The Subcommittee was now asked to revise paragraph 3 of the Release Print Standard, Z22. 55-1947, to incorporate use of this new all-purpose leader. Laboratory Some half dozen standards Practice are being reviewed by this committee but discussion on them was tabled until returns on the letter ballot, issued a few weeks before the meeting, are more complete. Instead the discussion revolved about two projects which have occupied the committee's attention for some time: ( 1 ) Screen Brightness in 1 6mm Laboratory Review Rooms; and (2) Printer Light Change Cueing. No fundamental differences exist about the latter and agreement was readily reached on a second draft soon to be circulated to the committee. Quite the converse is true of the former. Here there are two schools of thought, one holding that 16mm and 35mm screen brightness should be the same (9-14 ft-L) and the other arguing for a lower value (5-10 ft-L) in 16mm review rooms. The final decision was to issue a second letter ballot, this time setting forth the arguments for both positions and allowing for a choice of either set of values. Screen The 16mm review room Brightness screen brightness proposal was also discussed here and with similar views expressed. This committee will receive the same letter ballot prepared for the LP Committee. The Subcommittee on Instruments and Procedures submitted a final report of its findings. This was approved for Journal publication with but minor editorial changes. Wallace Lozier, Chairman, reported on the status of the revision of the Screen Brightness Standard, PH22.39. This has run the gamut of approval within the SMPTE, was published in the May 1952 Journal for trial (no adverse comment was received) and is presently being reviewed by ASA Sectional Committee PH22 — Henry Kogel, Staff Engineer. 441