McClelland and Nolan — The Electric Charge on Rain. 67 



Table III; 



Vi.^NefjafAvc Rain. 



Current in Amperes x 10"'» per sq. cm. 



<5 



5-10 10-20 



November, 



December, 



January, . 



February, 



March, 



May, 



Total, 



Here again we see the contrast between the winter and the spring or 

 summer months. This, of course, is altogether clae to the causes which we 

 have pointed out already — namely, that practically all the rainfall of the 

 winter months is made up of the liglitly chai'ged type, and that in the summer 

 months the heavily charged type occurs occasionally. As in the pievions 

 case we might note that the distinction is even more marked in the case of 

 the negative than in the ease of the positive rain. 



Maxwium Vcdites of Charge. 



It is interesting to note specially some of the highest values of the charge 

 that liave been observed. Each discharge of the tipping bucket corresponds 

 to 30 c.c, and each observation therefore deals witli that amount of rain. 





Table IV. 









A. — Positivf. Rain. 







Occasion. 



Cliuig 



e ])er r 



c. in Electrostatic Unit 



3rd May, 1911, 







3-4 

 3-3 



23rd June, 1911, 







9-1 



7-2 

 6-9 

 4-6 

 4-1 



