﻿NO. 7 



SMITHSONIAN EXPLORATIONS, I926 



197^5 n m rs It 17 ;8 



Fig. 8. — Selected pyrheliometry, solar constant and sun spot numbers 

 compared. Mt. Wilson work, Julys 19T0 to 1920. 



1921 I9S£ /9t2-} I9Z4 I9ZS 1926 192.0 192 1 1922 1923 <S'^4 I92 S 



Soldr Constdnt . Selected Pyrheliometry - 



, Sunspots ■ 



Fig. g. — Montezuma observations, all months, 1920 to 1925. 



