Mr Bald on the Ttmjytraiurt of Coal Mine*. l$5 
doud, formed by the condensation of the natural vapour of the 
mine in the freezing atmosphere. 
The following Table presents at one dew the temperature . of 
air and water in the deepest coal mines in Great Britain. 
Whiteha^ven CoUier^.— County of Cumberland, 
Fahf. 
Air at the surface, 55® 
A spring at the surface, 49* 
W ater at the depth of 480 feet,, 60® 
Air at same depth,. 63® 
Air at the depth of 600 feet, — , — 66® 
Difference of temperature betwixt water at the surface, and 
at the depth of 480 feet,. 11® 
Worldngton Collleri/. --County of Cumberland. 
Air at the surface, 56® 
A spring at the surface, 48® 
Water at the depth of 180 feet, 50® 
Water at the depth of 504 feet from the level of the ocean, 
and beneath the waters of the Irish Sea,. 60® 
Difference of temperature betwixt water at the surface and 
the depth of 504 feet,. IS® 
Teem. Colliery , — County of Durham. 
Air at pit bottom, 444 feet deep, in a country a little ele- 
vated above the sea, 68® 
Water at the same depth, 61® 
Difference betwixt the average temperature of water at the 
surface 49®, and water at the depth of 444 feet,, IS® 
Percy Main Colliery .' — County of Northumberland. 
Air at the surface, 4S® 
Water about 900 feet deeper than the level of the sea, and 
under the bed of the Biver Tyne,.., 68® 
Air at the same depth, 70® 
At this depth Leslie’s Hygrometer indicated dryness, . . 83® 
Difference betwixt the average temperature of water at the 
surface 49®, and of water 900 feet under the level of 
ihe sea, ip® 
