From equations (1) and (2)
d1 l22 X
V = ----- ----- --- ,
d2 l12 H
and
e 2d1 V
---- = ------ --- .
m l12 H
The values of V and e/m are thus completely determined from the combined results of the electric and magnetic deviation. It was found that
V = 2·5 × 109 cms. per sec.