CONSTITUTION AND TEMPERATURE ON MAGNETIC SUSCEPTIBILITY. 
115 
of temperature throughout the volume occupied by the phial. A layer of phosphorus 
pentoxide was placed at the bottom of the glass tube to absorb any moisture and 
thereby prevent the deposition of water on the phial during cooling. The liquid air 
tube was brought up from below into the position shown. The flange of cork CC 
was very broad and prevented any convection currents from disturbing the equilibrium 
of the suspended system. A copper German-silver thermocouple T was used to 
measure the temperature, one junction being situated just above the phial. The 
thermocouple circuit included a delicate D’Arsonval galvanometer. A slight kick, 
due to induction effects, was observed when the magnetic field was excited. This 
quickly died away and readings of the deflection of the phial and temperature were 
taken simultaneously. 
(3} Experiments up to 250° 0. 
The method of suspension used is essentially that devised by Curie, # and fig. 5 is 
a diagram of the apparatus, looking along the direction of the axis of the electro- 
FIG. 5 
magnet. The phial which was used in these experiments was open above and closed 
below, as shown at Q. The suspension rod, ASSS, was made of brass and was 
* ‘Ann. de Chim. et de Phys.,’ VII., vol. 5, p. 298, 1895. 
Q 2 
