Suiter Swantz IP takes a look back at past inventions and inventors with our Patent Of The Day.
On this day in 1904, Thomas Z. Millard and Phil Harold Palmer were granted U.S. Patent No. 753,508 for a LIGHT MEASURING INSTRUMENT.
The object of this invention is to obtain a photometer that will directly indicate the intensity of light transmitted to it and also to directly indicate the relation of the intensity of light emitted from an electric lamp to the current consumed by said lamp. This is attained by applying a retarding force or retarding forces to the rotation of the vane in an ordinary radiometer in such a manner that the vane instead of revolving completely around its axis will move through an angle the greatness of which depends upon the intensity of light striking the vane. Thus the intensity of said light is directly indicated upon a scale calibrated along said angle.
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