(under subclass 2) Devices wherein the sensing device is initiated by either or both (1) a change in weather condition (e.g., rain) or (2) variations in light intensity, including lack of light.
SEE OR SEARCH CLASS
49, Movable or Removable Closures,
21+, for closures responsive to or directly actuated by ambient fluid, e.g., rain, and subclass 25 for radiant energy, e.g., light controlled closures.
250, Radiant Energy,
200+, and the classes specified in the Notes thereto, for photocell electric circuits and photocell apparatus. Indented subclass 205 includes those in which the photocell controls a shutter in the path between the light source and the photocell.