Oft THE ELECTRICAL PROPERTIES OP PURE SULPHUR, 
119 
same amplitude as occur in the table. The corresponding logarithmic decrement is 
about • 4 . The galvanometer sensitiveness is 1’366 X 10 -11 ampere per scale division 
(Elliotts, at about 1 metre) of double elongation. We have to thank Mr. Pollock 
for assistance in making all the observations with this film. 
Time, 8 hours 55 minutes. Charged for three minutes, + terminal of battery to 
the upper plate. Voltage 1 Clark. 
'emperature 123'5° C. 
Galvanometer reversed A-B. 
D. deflection 
338 
55 55 
5 5 5 5 
B-A. 
55 
330 
5 5 5 5 
5 5 5 5 
A-B. 
55 
318 
5 5 55 
5 5 55 
B-A. 
55 
318 
„ 125° C. 
5 5 5 5 
A-B. 
55 
306 
„ 126° C. 
5 5 55 
B-A. 
55 
310 
Time. 9 hours L4 minutes. 
Battery reversed. 
Temperature 126 J C 
5 5 
55 
Galvanometer reversed A-B. 
>> >> }> B—A. 
126° C. Time 9 hrs. 20 mins. Galv. rev. A-B. 
B-A 
5 5 5 5 5 5 5 5 ^ • 
A 
5 5 5 5 5 5 5 5 
125° 
9 
2o 
B-A. 
Mean of all defections 350T. 
Mean Specific Resistance 1'8 X 10~ ] at say 124 0, 5. 
D. deflection 
414 
55 
392 
55 
392 
55 
372 
55 
363 
5 5 
348 
The capacity could not be taken. 
An attempt was made to detect residual polarization by the galvanometer—but 
without effect—the voltage to be expected being so small as to compare with the 
thermoelectric effects unavoidable with one part of the circuit so much hotter than 
the rest. We shall return to this. Observations showing an increasing resistance 
were made at various points down to 97° C., at which point the sulphur evidently 
began to crystallize, for the resistance increased so rapidly that we observed best by 
noting the rate at which the light spot moved over the scale towards the zero. The 
resistance increased meanwhile about twelvefold. Nothing is to be got by noting the 
rate of change of resistance with change of temperature, unless we had actually had 
a rapid thermometer between the plates. Our thermometer was merely in the inner 
box with the sulphur, and did not indicate the temperature-variation of the sulphur 
to be expected while it was freezing. The summary of the changes that occur is 
as follows (see table for numerical details). 
(1.) At 100° the resistance is considerably increased. 
(2.) Between 100° and 96° the rapid change begins. 
(3.) Between 96° and 93° the velocity of the change increases. 
