(under subclass 208) Subject matter in which the light transmitting portion of the shutter is adjusted in size in accordance with the speed of the shutter rotation.
(1) Note. The shutters of this subclass generally are so constructed as to vary the shutter aperture to keep the exposure of a light sensitive carrier constant despite variations in the drive speed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
152+, for shutters which close or stop in a closed position in response to a slow shaft speed for the purpose of fire prevention.
216, for shutters with manual adjustment of aperture.
