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<p>The object of this paper is to give experimental data on atmospheric absorption as it affects the measurements of the radiation constants. The paper gives also a recalculation of the coefficient of total radiation of a uniformly heated enclosure, taking into consideration all losses by reflection from the receivers, as well as losses by atmospheric absorption. The value of the coefficient obtained is ? = (5.722±0.012)×10/sup -12/ watt cm./sup -2/ deg./sup -4/, which is the same as previously obtained [Abs. 1916A00699]. The effect of atmospheric absorption upon data obtained at Naples is discussed, and it is concluded that, if a correction is made for absorption by water-vapour, the value of ? obtained at that station is of the order of 5.7. This is about th
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