302 Mr. Moyle on the Temperature of Mines. 
road to the Sultan Bello’s dominions was through a part of 
his; and as M. de Souza was most intimate with this sove- 
reign, he offered to accompany any of the gentlemen to his 
capital, Abomey, to obtain permission for them to pass through 
his territory: for this purpose Dr. Dickson was dispatched 
with orders to join the party in the interior. They were all 
in the best health and in high spirits. 
ON THE-TEMPERATURE OF MINES. BY M. P. MOYLE, ESQ. 
During the last summer and autumn, I repeated most of 
my former experiments on the water in the old and relin- 
guished mines as before stated (véde Annals, vol. v. N.S.), and 
almost precisely with the same results. Suffice it to say on 
this head, that the greatest heat found in those collections of 
water from the depth of 20 to 170 fathoms from the surface, 
was 55° Fahr. in Relistian mine, in the parish of Gwinear, 
while the coldest temperature found was 52° at 134 fathoms 
in Huel Ann, in Wendron. 
I conceived that by selecting a stagnant collection of water 
in a deep part of a mine at work, the temperature of which 
spot while it was occupied by the workmen was known, might 
more effectually give us the true temperature of the surround- 
ing strata, than by any other means. I, therefore, selected a 
winze* at the 110 fathom level, in Huel Trumpet tin mine, in 
the parish of Wendron. ‘This winze was sunk between four 
and five fathoms, when it was found necessary to relinquish it 
from the water being too quick; and until the 120 fathom Jevel 
was driven far enough under it to drain it of its water. 
A hole was bored in the solid granite at the bottom of this 
winze two feet deep; a thermometer was put into it, and the 
hole was soon found to fill with water from a natural infiltra- 
tion without a drop falling into it from above. As this hole 
filled with water, the thermometer fell to 56°, but in a few 
hours it rose to 70°, while the air at the bottom of the winze 
was 72°. I fastened a line to the thermometer, and allowed 
it to remain in the hole. The place was now relinquished, 
and was in the course of a few hours full with water, and great 
care was taken to prevent any of the water in common to the 
mine from running into this reservoir. On the following day 
this water was found at the surface 70°, at two fathoms in 
depth 68°, and at the bottom 67°: at the expiration of nearly 
three months, it was thought necessary to examine it again, 
as the approach of the end of the 120 fathom level might other- 
* A winze is a small shaft sunk simply from one level to another, often 
required for ventilation, as well as for the judicious working of a mine. 
wise 
