M'Ci>ELi.ANi) AND Gri.MouR — TItc Elcctric Charf/e on Rain. 25 



Taking the t'vo storms togctlier — 



Volume of positive laiii = 1122 c.c.s. 

 Volume of negative laiu = 946 c.c.s. 



Percentage positive = 54-2. 

 Amount of positive electricity brought clown = 80'2S E.S.U. 

 Amount of negative electricity bi'ought down = 79'29 E.S.U. 

 Percentage positive = 50-.'3. 



Tlie amount of positively charged rain is slightly in excess ; but the 

 amounts of positive and negative electricity brought down are almost equal. 



Sled. 

 Some sliowers of sleet, i.e., a mixture apparently of raindrops and snow. 

 fell in January and Maieh. In these showers the charge varied almost 

 continuously from positive to negative, and vice versa, being generally, thougli 

 not always, positive wlien the precipitation was in the form of rain, an<l 

 generally negative when the rain became mixed with snow, or when snow 

 alone fell for a few minutes. This sleet melted as quickly as it fell, so that 

 its charge was easily measurable in ti)e same manner as rain. 





Positive Precipitation. 





Date. 



No. of 

 observation?. 



Average 



charge per 



c.e. inE. S. U. 



Description. 



January 4, . 

 March 4, . 



i, ■ 



„ 28, . . 



4 

 29 

 16 



3 



•26 

 •057 

 •073 

 •018 



Ruin. 

 Bain. 

 Snow. 

 Sain. 





Negative Precipitation. 





Date. 



No. of 



observations. 



Average 



charge per 



c.c.inB. S. U. 



Description. 



January 4, . 



,. 4, . • 

 March 4, . 



4, . • 

 „ 21, . 

 „ 24, . . 



2 

 2 

 2 

 7 

 8 

 2 



•S2 

 2-11 

 •061 

 •045 

 •063 

 •048 



Eain and sleet. 



Snow. 



Rain. 



Sleet. 



Sleet. 



Sleet. 



