Page:On the Influence of Carbonic Acid in the Air upon the Temperature of the Ground.pdf/9

244 In this table the angle of deviation is taken as head-title. After $$\text{K}$$ and $$\text{W}$$ stand the quantities of carbonic acid and water-vapour traversed by the ray in the above-mentioned units. Under this comes after $i$ obs. the intensity of radiation (reduced) observed by Langley on the bolometer, and after this the corresponding value $i$ calc., calculated by means of the absorption-coefficients given in. $$\text{G}$$ is the "weight" given to the corresponding $i$ obs. in the calculation, using the method of least squares.

For the absorption-coefficients, calculated in this manner, I give the following table. (The common logarithms of the absorption-coefficients are tabulated.)

The signification of these figures may be illustrated by an example. If a ray of heat, corresponding to the angle of deviation 39°.45, passes through the unit of carbonic acid, it de-