(under subclass .2) Method or apparatus wherein the cessation of operation is caused by light responsive means which energizes an electric circuit upon occurrence of an undesired condition.
SEE OR SEARCH CLASS
192, Clutches and Power-Stop Control,
127, or 129+ for photo safety stop mechanisms.
200, Electricity: Circuit Makers and Breakers,
61.2+, for photo-responsive detection operating a switch means.
356, Optics: Measuring and Testing, 385+, for the photoelectric mensuration of a moving object by means of changes in visible light caused by the object; subclasses 429+ for the photoelectric monitoring of webs or threads for light reflection or flaws, and subclass 242.1 for visual thread counters.
