Cinematography — Recording head gaps for two sound records on 17,5 mm magnetic film — Positions and width dimensions
电影摄影与摄影;17.5mm磁膜上两个录音的录音头间隙——位置和宽度尺寸
This International Standard specifies the lateral positions and width dimensions of the recording heads for two magnetic Sound records and a control track on 17,5 mm Single perforated magnetic recording film.
lt also specifies the reproducing velocity of the film travel.