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April, 1945 NOMENCLATURE FOR MOTION PICTURE FlLM 287
1.1.2.1 Safety Base. Safety base is the slow burning film base used in motion picture film.
NOTE: At the present time, safety base and acetate base are synonymous and 16-mm film manufactured in the United States is of this form. All safety base must comply with American Recommended Practice for Motion Picture Safety Film, Z22.31-1941.
1.1.3 Film Perforations. Film perforations are the regularly and accurately spaced holes that are punched throughout the length of motion picture film. These holes are engaged by the teeth of various sprockets and pins by which the film is propelled and positioned as it travels through cameras, processing machines, projectors, and other film machinery.
1.1.3.1 35Mm Negative Perforation. A 35-mm negative perforation is the perforation used for negative and some special-purpose 35-mm films.
NOTE: It is a perforation with sharp corners, curved sides and a straight top and bottom, and its dimensions are as shown in American Standard for Cutting and Perforating Negative Raw Stock, Z22.34-1944 or latest revision thereof.
1.1.3.2 35Mm Positive Perforation. A 35-mm positive perforation is the perforation used for positive 35-mm film.
NOTE: This perforation is rectangular in shape with fillets in the corners, and its dimensions are as shown in American Standard for Cutting and Perforating Positive Raw Stock, Z22.36-1944 or latest revision thereof.
1.1.3.3 16Mm Perforation. A 16-mm perforation is the perforation which is used in all 16-mm film.
NOTE : This perforation is rectangular in shape with fillets in the corners, and its dimensions are as shown in American Standard for Cutting and Perforating Negative and Positive 16-Mm Raw Stock, Z22. 13-1944 or latest revision thereof.
1.1.4 Fine-Grain. Fine-grain is the term used to designate film emulsions in which the grain size is smaller or finer than in the older type emulsions commonly employed prior to about 1936.
NOTE: This term is relative as there is a wide variation in grain size among various fine-grain films. It is probable that the term will become obsolete when all film emulsions become fine grain. There is no inverse term such as coarse grain.
1.2 Direct Play-Back Positive. A direct play-back positive is a sound film which is so originally exposed that upon development in a single developer bath, the resulting image is in positive form available for normal sound reproduction. NOTE: It is often a variable-area sound record.