On the nature of Atmospherics.-III

Abstract

The present paper continues the account of investigations on the nature of atmospherics given in papers I and II of similar title. As the argument is essentially continuous from paper II to paper III, the numbering of equations, tables and figures has been made to run continuously from the former to the latter paper. II.— Semi-Permanent Field Change Determinations . As has been mentioned in the preceding paper, the cathode-ray oscillograph assembly may be used for the determination of the sign and magnitude of net changes of the earth’s electric field, and when thunderstorms were not far distant measurements of such changes were made at Aldershot and Helwan by this method, which will be referred to as method A. The magnitude of the field changes was calculated with the aid of equation (9).