Excerpt from On the Determination of the Mean Horizontal Intensity of Incandescent Lamps by the Rotating Lamp Method
In a modified form of this method which is used in Germany, the direct light in a definite direction from the lamp is supplemented by light re¿ected from two m... irrors placed behind the lamp and inclined at an angle of 1200, so that an illumination is produced on the photometer screen, which is approximately proportional to the mean of the intensities in the three directions. Liebenthal has shown2 the possible errors incident to this method, for the types of lamps studied, to be as large as 5 'or 6 per cent when the lamps are definitely oriented, and I 3 per cent when the lamps are set at random.
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