The initial step was to calculate for each day the 

 averar^e value of Q^^]-, accordin'.'; to equation (3). These values 

 for the total Incorainr^ radiation are '-jiven in the first colujin 

 of table IV. In like manner, values for Q^^ may be computed 

 by using meteorolo^^ical values given in table III and equation 

 ik) ' These computed values for the back radiation appear in 

 the second column of table IV. Both these sets of values are 

 given m g. cal^ cm. ram. . 



Table IV 



-;;-Inaccurate pyrheliometer due to shock. 

 Computed and measured rates of total incoming 

 and back radiation (g. cal. cm~2 min.~l) for 

 20-27 April 195l. 



23 



