Bennetr—Actinometric Observations of the Solar Eclipse. 369 
similar curve to the above when there was no eclipse, 7.e. to get 
the curve representing the decrease in actinic effect of the Sun’s rays 
due to decrease in altitude alone. This was done in two ways. 
One curve was found by drawing freely a curve, the continuation 
of the branch of the observed curve before it reached A, and alter 
it passed C. This is the continuous curve APCD in fig. 1. 
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2) _~ afirst Contact Greatest Phase Last. Contact 
Fig. 1. 
2D2 
