US PATENT SUBCLASS 356 / 223
.~.~ Logarithmic


Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

213  DF  PHOTOMETERS {9}
218  DF  .~ Photoelectric {9}
223.~.~ Logarithmic


DEFINITION

Classification: 356/223

(under subclass 218) Subject matter wherein the readings of the meter or indicator bear a logarithmic relation to the variations of the light sensed by the light responsive device.

(1) Note. The logarithmic relationship may be obtained by a logarithmic amplification or attenuation of the electrical coupling between the detector and indicator, or by a logarithmic variation in the magnetic circuit of the galvanometer indicator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

224, for multi-sensitivity range photometers.