Abstract
Measurements have been made of the effects of changes in atmospheric humidity on the irradiance from an incandescent lamp, for test distances 1 and 3 m and for a range of water-vapour pressures 1 to 15 torr. With a 1 m path the absorptance of the vapour is proportional to the vapour pressure, but with a 3 m path the relationship is non-linear.
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