Abstract
It is shown theoretically that in telephotometry in a foggy atmosphere, large errors may arise from the scattering of light by the fog into the telephotometer. These errors depend both on the angular aperture of the telephotometer and on the half-angle of the cone of air illuminated by the distant lamp. Some experimental results are given, which show even larger errors than the hypothetical atmospheres chosen for theoretical investigation.
© 1949 Optical Society of America
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