NO. 4 SOLAR RADIATION ABBOT, FOWLE, AND ALDRICH 



19 



Table 8 — Air-masses and Smoothed Curve Ordinates 

 Bolographs of September 20, 1914 



1 This factor includes consideration of rotating sectors used, reflecting power oi coelostat, 

 and transmission in spectroscope. 



2 Galvanometer deflections are here expressed in tenths of millimeters. 



3 Bolograph III is a little low in a few points by interference of leaves of a tree. 

 * Bolograph IX is omitted because a guy wire interfered. 



5 Extremely doubtful points, and those for which deflections are less than 1 millimeter, 

 are omitted. 



After reducing the measured ordinates (by means of factors 

 given) for transmission in the apparatus, in accordance with the 

 practice of Langley and ourselves, we corrected these new ordinates 

 of the bolographs for the slight changes of sensitiveness of the bolo- 

 metric apparatus. We determined these changes of sensitiveness by 

 comparing the areas included under the holographic curves with the 



