1902 - 3 .] Magnetization and Resistance of Nickel Wire. 503 
one was twice that in the other. The wire wound with the 
double pitch gave a slightly smaller diminution of resistance when 
placed in the same field ; but with neither was the increase of 
resistance in the lower fields obtained. These coils, however, 
were not made of the same wire as that used in the first coil. 
Two flat spiral coils of the original wire were then wound and 
pressed on opposite sides of a piece of mica ; and in the first 
experiment with this double flat coil no initial positive maximum 
was obtained. In the lower fields the indications were somewhat 
uncertain owing to the smallness of the total resistance of the 
Resistance Change in Nickel Wire 
it had been readjusted with a heating coil round it, a positive 
maximum was obtained which seemed to vanish at a temperature 
of 300° C. The curves obtained in these experiments at ordinary 
temperatures were very similar to that figured, keeping close to 
the horizontal axis until about field 1500, and then rapidly passing 
downwards. 
The experiments indicate that in fields below 1500 the change 
in resistance due to transverse magnetization is very small, 
probably decrease; but that in higher fields the change accom- 
