Projector

(1) The projector shall be fitted with an automatic safety shutter or cut-off inserted between the film gate and the projection light and so arranged that it will automatically close and prevent the heat and flame of the projection light from coming into contact with the film when the projector is operating below the normal safety speed or when idle. (2) The shutter or cut-off shall be maintained in good working order and adjustment at all times. 12 Cinematographs (3) The construction of the film gate shall be substantial and so made as to afford ample heat-radiating surface. (4) The passage for the film through the gate shall be sufficiently narrow to prevent flames from travelling upwards or downwards from the light-opening.