ON UNDERGROUND TEMPERATURE. 



37 



the mine has been but recentlj' opened to its present depth, and the in- 

 fluence of atmospheric temperature •v\ill every year become more sensible 

 in the strata below. 



The annexed figure represents the protected 

 maximum thermometer, designed by Sir "W. 

 Thomson for the purposes of the Committee. 



A is the protecting case of glass hermetically sealed, 

 B the Phillips's thermometer enclosed in it and 

 supported by three pieces of cork, c, c, c. A small 

 quantity of spirit, 5, occupies the lower part of the 

 case, the remainder of the space being filled with 

 air, and d is the air-bubble characteristic of Pldl- 

 lips's thermometer. The detached column of mer- 

 cury above d remains suspended by adhesion in 

 - spite of moderate shaking. The instriunent has 

 been found to register correctly even imder a 

 pressure of 2^ tons to tho square inch. 



B 



Section of Strata sunk through (with shaft IG feet diameter) at Eose-Bridge 



Collieries, Ince, near Wigan. 



No. on 

 Sect. 



3. 

 4. 

 5. 

 6. 

 7. 

 8. 



10. 

 11. 

 12. 



Description of Strata. 



Outset 



Soil 



Clay 



Strong marl and boulders... 



Dark-blue shale 



Grey rock and ironstone . . . 



Strong dark-blue shale 



Grey rock 



Very strong light-blue shale 



(with fossil ferns) 



Grey freestone rock, very 



open, with water 



Light-blue shale 



Coal, inferior 



Coal and soft shale 



Warrant earth, very soft ... 



Carry forward 



Thick- 

 ness. 



yds. 

 9 

 

 1 

 10 

 12 

 

 4 

 



ft. in. 







1 

 0, 



2 

 

 2 8 

 6 

 2 



4 1 



1 11 



53 11 



No. on 

 Sect. 



13. 

 14. 

 15. 

 16. 

 17. 



18. 



19. 



20. 

 21. 

 22. 



23. 

 24. 



Description of Strata. 



Brought forward 

 Strong linn and wool 



Dark blue shale 



Inferior coal and shale 



Warrant earth 



Strong blue shale 



Coal 



Soft warrant earth 



Dogtooth shale and bands 



of rock 



Dark -brown shale 



Strong grey rock 



Strong grey shale and bands 



of rock , 



Burr-stone 



Strong blue shale 



Carryforward .... 



Thick- 

 ness. 



yds. 



53 



2 



7 

 1 

 1 

 4 

 

 



ft. in. 



11 



1 



2 5 

 3 







1 10 

 1 11 

 1 6 



