1894-95.] Variation of Resistance in a Magnetic Field. 493 
On the Variation of Resistance in a Steady Magnetic 
Field observed in Nickel, Antimony, and Tellurium 
Plates. By J. C. Beattie. (With a Plate.) 
(Read July 15, 1895.) 
Whether the variation of resistance in conductors in a steady 
magnetic field depends on the field strength, on the magnetisation, 
or on both, does not seem to be definitely settled. The various 
experimental methods as yet used are fundamentally similar in 
principle, and have the disadvantage that the experiments are 
difficult to perform. 
A method where the experimental difficulties are very few is to 
be found in the comparison of the variation of resistance for any 
given field-strength with some other phenomenon whose depend- 
ence on the field-strength or on the magnetisation is already known, 
and whose exact determination offers no experimental difficulties. 
Such a phenomenon is the transverse effect. Kundt has shown 
that this is in iron, nickel, cobalt, gold, and silver proportional to 
the magnetisation. In antimony and tellurium, however, we can 
only infer the relation by a comparison of their curves with those 
for the above metals, or for bismuth (pure), where the same rela- 
tion holds. 
That for antimony, viz., tho curve showing the relation of the 
transverse effect to the magnetic field, is a straight line agreeing 
with those for gold and silver ; we are justified, therefore, in assum- 
ing the transverse effect in antimony to be — as in gold and silver — 
proportional to the magnetisation. The corresponding curve for 
tellurium is also approximately a straight line, or, more exactly, 
two straight lines concave to the field-axis, which again suggests 
that the transverse effect is proportional to the magnetisation. 
On account of the short time at my disposal, I found it impossible 
to investigate iron and cobalt plates, and in nickel only the varia- 
tion of resistance perpendicular to the lines of magnetic force was con- 
