ELECTROMAGNETIC EFFECT OF CONVECTION-CURRENTS 



263 



ber now is 2-7 X 10~ 7 r slightly more sensitive. The scale distances 

 were 110 and 200 cm. respectively. So this experiment gives about 





TABLE I. 



TABLE II. 



the same scale-deflexion at twice the distance with a force ^ as great. 

 The agreement between the two is seen to be quite good. 



The observations, except Nos. 1, 2, 15, and 18 given above, were taken 



