Taste I.—Showing the Results of Observations on Subterranean | ; 
the Ratio of its Increase at different Depths. 
the deepest levels or accessible parts of the respective mines. 
ao mo b 
ann 
— | Number. 
| 
Date of 
Observation. 
1822 
1827 
1827 
1822 
1822 
1820 
1820 
1820 
1822 
1820 
1830 
1824 
1824 
1824 
1827 
1827 
1827 
1822 
1819 
1822 
1822 
1822 
1822 
1$20 
1820 
1820 
1827 
1827 
1820 
C. stands for Copper Mine. 
= re T. ditto Tin _ ditto. 
Mines and Localities. G. for Granite. 
K. for Killas. 
South Huel Towan, St. Agnes, C.K. in cistern 
or reservoir at the bottom 
Huel Wellington, near Camborne, C.K. small 
stream from Western end of deepest level...... 
Ditto ditto ditto Eastern ditto ......... 
East Liscombe, near Tavistock, C.K. in deepest 
CISCTED) sonsnadascnacseccsscececcusscsccsvvavecesvoseues 
Huel Unity- Wood, Gwennap, Tin, K. in ditto. eoes 
saeecere ae ee ereeseesees 
*Huel Unity, Gwennap, T. and C.K. ........ cantase 
Ting-Tang, ditto C.K.,, in the lode ......... 
Huel Gorland, ditto CAS GRRECRACScoc ee seacoanone 
Means of depths and temperatures... 
Beer- Alston, Beer-Ferris, Devon, Lead and Sil- 
ver K., in deepest cistern iP 
Huel Squire, Gwennap, C.K., in deepest cistern.. 
Huel Rose, Newlyn, Lead, K., deepest level 
Chasewater, Chasewater, Tr. K., in E. end of 
deepest level  ....sscescccesccesecrsececccerscccncees 
Ditto ditto, W. end of deepest level ....«: 
Huel Trumpet, Wendron, T.G., in deepest level... 
*Huel Jewel, Gwennap, C. and T.G., 40 fathoms 
to the E. of shaft, and 4 feet from end of level 
Ditto ditto, 18 ditto, W. ditto, and 4 feet ditto 
Huel Vor, near Helston, T.K. in ge level, 
4 fathoms from shaft 
*Consolidated Mines, Gwennap, C.K. in n lode, 16 
fathoms E. of Job’s shaft J2..0...0..s<scces cesses 
Treskerby, near Redruth, C.G. in lode....... eo 
Poldice, Gwennap, T. and C.K., bottom of 
Trussel’s shaft......... eCeNERE so Sudaeseaneeetes ste 
Ditto ditto ditto of Oppy’s shaft .. 
Consolidated Mines, C.K., bottom of Job’s ditto... 
Ditto ditto ditto of Taylor’s ditto... 
Huel Damsel, Gwennap, C.G. .........cccsceceesesers 
*United Mines, ditto, C.K., end of level N. of 
Sampson’s shaft, and supposed 6 feet from lode 
Pree reer rere errr r rrr er egy 
* Ditto ditto ditto, W. of ditto in lode... 
Hnel Alfred, near Hayle, C.K., E. end of level... 
Ditto ditto Gitta; Wi dittO.ececse.00s 
*United Mines, K., in the lode E. of shaft............ 
Means of depths and temperatures ...... 
Means of temperature .......esseseeeeee oe 
Deduct mean temperature of climate ... 
Means of depths in fathoms, and of excess of 
temperature above climate 
sent e eee tee weeeeneneee 
Which being estimated at the depth of 100 fa- | 
thOMs, GIVE 6. sscccses cvcotesconsecseeseccsscsscass i 
The experiments: 
a 
4 
¢ 
Depth from | Temperature || _ 
Surface in of Rock, |} 
Fathoms. Fahrenheit. 
90 
110 
——— ~ 100° 00 
