Abstract
Landsberg's method of obtaining integrated values of ultraviolet radiation makes use of small glass rods that, under the influence of ultraviolet radiation, change their color from green to various shades of purple when longitudinally viewed. Investigations of the original standards consisting of a set of pre‐exposed and calibrated rods revealed the instability of the glass color. Two new methods of standardization have been developed; one involves a complementary wedge filter by means of which the color of the rod is compensated to neutral, the other one employs a set of partly‐covered rods, so that the rods themselves furnish the chromatic compensation. The stability and saturation characteristics are discussed and tentative calibration curves presented.
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