;46 
PROFESSOR W. Gr. ADAMS AND ME. E. E. DAY ON THE 
current from S to P at the end which had been heated. With the unmarked end heated 
by the hand there was at first a current of 90 from S to P, which was replaced by a 
current of 90 from P to S, while the finger was kept on the junction. On removing the 
finger the current diminished to 30 from P to S, and then very slowly back to zero. 
Experiments were also made on this piece with the hot-air blast. 
On heating the marked end there was a current of 100 from P to S ; on continuing 
the blast the current diminished to 20 in the same direction, and then increased again. 
On heating the unmarked end there was at first a current of 150 from $ to P at the 
heated end, which diminished to zero, and then increased again on the same side to 50 
while the blast lasted. On stopping the blast there was a current of 60 in the opposite 
direction, which rapidly fell to zero. 
These experiments were repeated. 
On heating the unmarked end there was, first, a current of 75 from S to P at the heated 
junction, and then a current of 60 from P to S while the hot blast lasted. The current 
rapidly fell to zero when the blast was removed. Figure 1 is intended to represent 
these changes, currents being measured by deflections to right and left, and time down- 
wards. 
On heating the marked end we have the changes represented in fig. 2, the break 
denoting the stopping of the blast — a current of 120, which fell to 50 and then rose 
to 60 while the blast lasted. When the blast was removed there was a current of 10 
in the opposite direction. 
