96 REPORT—1857. 
carrying 1000 tons weight British, would carry 1015 metrical tons, and be 
registered accordingly, recommends itself, not only by its use among many 
of the chief trading nations, but by its adaptation to the requirements of in- 
ternational commerce, to the convenience of mariners, and, most especially, 
to the measurement and registration of vessels of all kinds as respects their 
capabilities for carrying weight: to which it must be added, that the system 
of weights and measures to which this ton belongs, and which is every year 
extending through the world, is the only system which appears at all likely 
to become universal ; so that the metrical ton weight must be adopted as the 
basis of tonnage registration, if international tonnage is to be pursued as an 
indispensable part of a really good method. 
JAMES YATES. 
Lauderdale House, Highgate, Feb. 14, 1857. 
Report on the Temperature of some Deep Mines in Cornwall. 
By Ronert Were Fox, F.R.S., G.S. 
In compliance with the request of the Committee of the British Association, 
I have had further experiments made on the temperature of some deep mines 
in Cornwall by careful observers, and I have now to report the results of 
their investigations*. But before I do this, it may perhaps be well to allude 
to the method of working, or rather exploring a metalliferous vein or “lode” 
in this county. The horizontal bearing of most of the lodes is from east to 
west, or rather from northward of east to southward of west; and they 
descend into the earth to an unknown depth, and much more often in an 
inclined than a vertical direction, intersecting the different rocks which occur 
in their courses. The miners work a lode by means of shafts, and galleries or 
“Jevels,” which latter, being on the course of the lode, do not usualiy succeed 
each other in a vertical, but in an inclined direction. 
Fig. 1. Fig. 2. 
Let fig. 1, a, b, represent a north and south section of a lode inclined to- 
wards the north; ec, d an engine-shaft through which the water is pumped 
* I am indebted to my friend William Hustler of Rosemerryn, near Falmouth, for the 
results obtained in the United Mines, and most of those in Fowey Consols ;—to Captain 
J. Puckey, Manager of Fowey and Par Consols, for experiments in those mines ;—to Captain 
Charles Thomas, Manager of Dolcoath, for an experiment there; to Captain Jennings of 
Tresavean, for some made in that mine in 1853; and to Henry Peters of Lanner, near Red- 
ruth, for the other experiments in Dolcoath, in Levant, and Botallack Mines, 
eo eee 
