1902-3.] Magnetization and Resistance of Nickel Wire. 501 
Note on Resistance Change accompanying Transverse 
Magnetization in Nickel Wire. By Professor C. G. 
Knott, D.Sc., and Mr Peter Ross, M.A. 
(Read July 20, 1903.) 
The following result, which forms a part of a prolonged investiga- 
tion into the relations existing among the quantities, magnetization, 
resistance, and temperature of the magnetic metals, seems sufficiently 
novel to merit a short note. The results for longitudinal magnetiza- 
tion were communicated to the Society on May 4, 1903 ; and a some- 
what similar form of apparatus was set up in order to study the 
effect of high temperatures upon the connection between transverse 
magnetization and resistance in nickel wire. The smallness of the 
effect of resistance in nickel due to a transverse magnetic field, as 
compared with the effect of a longitudinal field, rendered all attempts 
to measure it with this form of apparatus quite nugatory. We were 
compelled to fall hack upon the method employed by Kelvin, 
Goldhammer, and others, and use the air-gap of a fairly powerful 
electromagnet as the field. This enabled us to magnetize a coil of 
3 cm. length in fields reaching nearly 3000 units. 'With a view' to 
the main object of our work, namely, working at high tempera- 
tures, the nickel wire was wound with asbestos insulation. It formed 
one arm of the usual Wheatstone Bridge arrangement, the changes 
in resistance being measured by deflections on the galvanometer 
after a nearly perfect balance had been produced. The approxi- 
mate balance was rapidly adjusted by use of a “conductivity” 
resistance-box placed as a shunt in the branch opposite the nickel 
wire which was the object of investigation. With an adjustable 
resistance of this kind the galvanometer could be calibrated at a 
moment’s notice. 
So far as we are aware, other experimenters have found a decrease 
of resistance in nickel when magnetized transversely, and an increase 
when magnetized longitudinally. The present results seem to 
