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(3) Motion picture aperture.
(a) Standard film. Ninety hundred and sixty ten-thousandths (.9060) of an inch wide by sixty-seven hundred and ninety-five tenthousandths (.6795) of an inch high.
(4) Frame line
(a) Standard film. The frame line shall be half way between two successive perforations on each side of the film.
(b) Safety standard film. Frame line shall pass thru the center of a perforation on each side of the film.
(b) Recommended Practice
(1) Projection angle. Should not exceed twelve (12) degrees.
(2) Projection lens mounting. Should be such that light from all parts of the aperture shall have an uninterrupted path to the entire surface of the lens.
(3) Projection Lens Focal Length. Tolerance not to exceed one per cent of that indicated.
(4) Take-Up Pull. Should not exceed fifteen (15) ounces at the periphery of a ten inch reel, or sixteen (16) ounces on an eleven inch reel.
(5) Thumb Mark. The thumb mark on a lantern slide should be located in the lower left hand corner next the reader, when the slide is held so that it can be read normally against a light.
B. It is proposed that the following terms be referred to the Nomenclature Committee as being merely definitions.
(1) Intermittent Gear Ratio
(2) Lantern Strip
C. It is proposed that the following terms be at present omitted for the reasons noted.
(1) Projection Lens Foci —
(a) Wrong use of word "foci."
(b) No lower limit set.
(c) Standardization will not affect manufacture in any way.
(2) Reel
(a) Objection has been raised to these dimensions.
(b) One of the dimensions given is never used in practice.
(3) Projection Lens Opening
(a) Word "opening" too vague.
(b) The lens barrel is the thing for which a standard diameter would be beneficial.
(4) Leaders and Trailers
(a) Transparent colored trailers are not in use, nor are they desirable. (See substitution offered in E below.)
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