314 REPORT—1840. 
Mean results of temp. at 100 fathoms under the surface. 
Rock = 16°75 + 50 = 66°75 
Water = 16°26 + 50 = 66°26 
Air = 16-27 + 50 = 66°27 
Mean 16-43 66°43 
At 200 fathoms under the surface. 
Rock = 8°82 4+ 66°75 = 75°57 
Water = 11-27 + 66°26 = 77°54 
Air = 11°73 + 66°27 = 78°00 
Mean 10°61 77°03 
Taste II. 
Temperature observed in different parts, but not the deepest, 
of the following mines, in Cornwall and Devon; Huel Abra- 
ham, Dolcoath, United Mines, Treskerby, Huel Squire, 
Ting Tang, Huel Gorland, Huel Damsel, Chasewater, Huel 
Unity, Huel Vor, Huel Unity-Wood, Beer Alston, Poldice, 
Consolidated Mines, Huel Friendship, Huel Maid, Nangiles, 
North Huel Virgin, Tresavean, etc. 
Ratio of Depth to a given 
S 
Depth S24) Increase of ‘’emperature. 
Fa ehcads Temperature, Fahrenheit. S 3 Ee ; 
: =| Fathoms Temp. |General Mean, 
[o} °o 
O60 AP GG. G7. 50. Bos, eens suancteoss oscvavacsostascaak Wisoueesne eavecd cathe 56°00 Surface = 50 
20... 30) 61.55.64. + 56. 58. secscccesresceoes - | 58°80 
30... 40| 56.60. 54.56. + 61.62. 50. 62.61.57. 
40... 50| 58.60. 60. 60. 60, + 63.58.58. ....-.-. 
50... 60) 60. 62. 60. 58. + 63. 63. 61.61. 62. 60.57 
60... 70/61. + 62. 64.61. 61.59.68. . 62°29 
70... 80 | 64.62 64.64.62. + 64.66.70. - 64-92 ° 
80... 90) 66. 64, 63.64.66. + 65. 69.62.67. .. 65°11} 50°00! 60°72 
—50°00 
fms. 
66°64 50°00) 10°72 jor 46°64=10 
oO 
130°00| 70°54 
75°50| —46°64) 60°00 
74:50] 9336|=10°54 | or 79°09=10 
| 74°17 
MOU ean DUO tate Jlaigile fas dfic GBs aarcucorecccessvasapcacvevercs 
‘ 
125°73 =70 
° 
185°00| 74°72 
—125°73| 70°00 
59°27 |= 4°72 | or 125°57 = 10 
Computed from Means of Depth and Temperature 
251°30 = 80! 
The figures on the left indicate the temperature of the rock, rubbish. o i 
a I r r water ; those he ri 
the air ; in the respective mhines, they are divided by ais Bs si 
ght, of 
