"While at the time when I carried out this calculation on the basis of the radiation law an exact test of the value... was... impossible... it was not long before E. Rutherford and H. Geiger succeeded, by... a direct count of the α-particles, in determining the value of the electrical as 4.65 10-10, the agreement... with my value 4.69 10-10... a decisive confirmation of my theory. ...[M]ethods ...by E. Eegener, R. A. Millikan, and others... have led to a but slightly higher value."