Magnetism on a permanent Electric Current. 303 



strip, the current through the Thomson galvanometer may be 

 reduced to the extent desired. 



In ordinary experiments such a plate as that just described 

 is placed between the poles of the magnet in such a position 

 that the direction of magnetic force would be represented by a 

 perpendicular to the plane of the paper in the above drawing. 



Fio-. 2. 



In the variation upon the main experiment a plate was em- 

 ployed similar to the above, but narrower, and with very short 

 side clamps. This plate was first placed between the poles of 

 the magnet in the usual position, as shown by the heavy lines 

 in fig. 2. 



With this arrangement a permanent deflection of about 30 

 centims., on the scale before the Thomson galvanometer, could 



Z2 



