. The Astrophysical journal. riations of the corresponding co-ethcients of transmission of the earthsatmosphere: large values of the solarconstant correspond to small valuesfor the coefficients of transmissionand vice versa. To investigate this in a more gen-eral manner the corresponding resultsfor white hght for other observers arecompared. The same relation cameout in case of the observers between1902 and 1907 at Washington; alsobetween 1905 and 1912 at MountWilson, California, and from 1911 to1912 at Bassour in Algeria.^ Fig. 2 represents graphically theobservations which were made for thep
. The Astrophysical journal. riations of the corresponding co-ethcients of transmission of the earthsatmosphere: large values of the solarconstant correspond to small valuesfor the coefficients of transmissionand vice versa. To investigate this in a more gen-eral manner the corresponding resultsfor white hght for other observers arecompared. The same relation cameout in case of the observers between1902 and 1907 at Washington; alsobetween 1905 and 1912 at MountWilson, California, and from 1911 to1912 at Bassour in Algeria.^ Fig. 2 represents graphically theobservations which were made for thepurpose of clearing up the nature ofthe short-period variations of thesolar constant, which were obtainedsimultaneously in 1911 and 1912 atMount Wilson (W), and in Bassour(B). The abscissas here denote thetime, and the ordinates at the leftdenote the final values of the solarconstant and at the right the apparentcoefficients of transmission; here thesolar constant is denoted by the solidline, and the coefficients of transmis-. C. Fig. 2G. Abbot, op. cil., 2, 96 3, 102-24. TEMPERATURE AND RADIATION OF THE SUN 213 sion by the dotted lines. Since the ordinates increase at the left andright in the opposite sense, the result is that the two phenomenaare certainly demonstrated to have a parallel progression. We may furthermore note that the above-mentioned effect ofthe eruption of Katmai in the latter half of 1912 showed itself bothat Mount Wilson and at Bassour in a simultaneous decrease of thecoefficients of transmission at the end of June and still more at theend of July. But since a parallel progression of the coefficients oftransmission %\ith the solar constants is demonstrable at bothstations, we may indirectly expect an approximately simultaneousoccurrence of the extreme values for the solar constant at bothstations. C. G. Abbot called attention to such close coincidenceof the extreme values of the solar constant from these last observa-tions at two widely separated stations; b
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