(under subclass 201.1) Subject matter having means for controlling the intensity of the light source which illuminates the photoelectric cell in accordance with the illumination which falls upon the photoelectric cell.
(1) Note. In addition to the means for controlling the light source, there may be means between the light source and the photoelectric cell to variably divert or absorb the light which passes from the light source to the photocell. Where the sole means for controlling the light which reaches the photoelectric cell is means to variably divert or absorb the light rays, the patent is not classified in this subclass, but will be found in subclasses 201.1 through 204 above.
(2) Note. The light source whose intensity may be controlled may be an electric light, a gas flame or any other source of light.
SEE OR SEARCH THIS CLASS, SUBCLASS:
201.1, through 204, see (1) Note above.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems, 151, where the source of illumination is an electric lamp or gas or vapor discharge device, the photocell controls the electrical condition or electrical characteristics of the source of illumination and there is no significant optical structure in the optical path between source of illumination and photocell.
