NO. 9 SOLAR ECLIPSE I918 — ALDRICH 17 



values are considerably in excess of the nocturnal radiation values 

 obtained after dark the night following" the eclipse, with humidity 

 and sky conditions nearly identical. This was to be expected because 

 of the higher temperature during totality. So far as can be seen from 

 these values, they uphold the conclusion of Angstrom that " the 

 effective temperature radiation during the day follows the same laws 

 as hold for the nocturnal radiation." 



Table 3 is appended, showing values of nocturnal radiation found 

 by Angstrom with clear skies under varying conditions and compar- 

 ing them with the Lakin values. That the latter are lower than 

 Angstrom's values may be due partly to the veiling effect of the thin 

 cirrus clouds at Lakin, and partly to the difference in scales of noc- 

 turnal radiation above noted. 



