1295 
At first the effects 1 and 3a had the same direction. Before the 
compensating coil A was put in action the amplitude amounted to 
several meters; but by means of compensation IT this could be 
reduced to a few centimeters. Continually changing the compensation 
I made several determinations, some of which are given below. The 
straight lines represent the distance over which the cross-wire moves 
to and fro on the scale, the right hand side being the positive one. 
Beneath each line the length in em is given. A always indicates the 
position of the wire at the moment of a sign and the arrow shows 
the direction in which it is then moving. 
Deviation 
I ovine. SALEEN be em: 
I Ends a 
[ily Sete ee ne er 8 a 
Dee en Zo 
v A5 4 
Azimuth of the eylinder changed by 180°. Now the effects 1 and 
3a are opposite to each other. 
vi SEN 5 ein. 
EE AN 105 , 
VIII Ac One 
NN ———— oe 
KI 6 
XIII A_, ee 
