The London, Edinburgh and Dublin philosophical magazine and journal of science . hows the relation between the degree of relativehumidity of air and the radiation-difference. For every singleset of observations the relative humidity was computed. (7) It remains yet to be mentioned that the elaborate task ofclassifying and reducing the 4376 single sets of observations hasbeen twice executed, both computations being quite indepen-dent of each other. (8) With a view to show that the decrease in radiation withan increase in humidity, as evident from Table II., is not dueto the decrease in temperat
The London, Edinburgh and Dublin philosophical magazine and journal of science . hows the relation between the degree of relativehumidity of air and the radiation-difference. For every singleset of observations the relative humidity was computed. (7) It remains yet to be mentioned that the elaborate task ofclassifying and reducing the 4376 single sets of observations hasbeen twice executed, both computations being quite indepen-dent of each other. (8) With a view to show that the decrease in radiation withan increase in humidity, as evident from Table II., is not dueto the decrease in temperature, as may be suspected when glan-cing over Table II., two more Tables were constructed illus-trative of the influence the temperature of the air alone exerts onthe radiation-instrument (Tables III. and IV.). For, althoughfully aware of the principles generally adopted with regard tothe influence of the temperature of the air on radiation, and alsoof the results of your investigations (§ XII. p. 406), to the * In strict conformity with the instructions of the Royal 512 M. Neumayer on Aqueous Vapour effect that the temperature of the surrounding air does not sen-sibly influence the difference of temperature between the ra-diating body and the temperature of the air, I thought one mightbe;inclined to suspect undue radiation influencing the readingof the parabolic thermometer, and I took for this reason thetrouble of classifying the observations merely according to tem-perature of the air. The results at which I arrive may be summed up in the fol-lowing lines:— (a) The absolute quantity of aqueous vapour in the air is in itselfalone not sufficient as a criterion for the degree of radiation ; orif it should be otherwise, the instrument used for the observa-tions is not sufficiently delicate to show the degree of influence. (b) The absolute quantity of aqueous vapour, together with acertain temperature, i. e. the relative humidity of air, greatlyinfluence terrestrial r
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