380 



DR. G. C. SIMPSON ON THE ELECTEICITY OF 



of the residence of the author. Through a hole in the centre of the roof the rain fell 

 into an insulated receiver AA which was connected to a self-registering electrometer. 



FIG. 1. 



In order to prevent the rain which fell on to the roof near the hole from splashing 

 into the receiver, a galvanised iron cylinder BB was fitted to the hole with its top 



