Publisher's Synopsis
Excerpt from On the Determination of the Mean Horizontal Intensity of Incandescent Lamps by the Rotating Lamp Method
Of the above four methods by far the most convenient in commer cial testing is that of rotating the lamp, because but one measure ment is required, and there is no question about the orientation of the lamp. Moreover, by simple mechanical devices a reversal of the direction of rotation may be obtained so that lamps fitted with screw bases can automatically be screwed into and out of the socket, thus materially lessening the time required for measurement. Although the method of rotating the lamp is the most convenient it has been open to serious objection on account of possible errors which have never been investigated, so that while the method is in quite general use in this country there are many who are in doubt in regard to its accuracy, and its adoption abroad has been restricted.
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