ON SUBTERRANEAN HEAT. ] 53 



j^allery at its foot, I entered another shaft, Tempe- Depth. Tabulated 

 wliirh terminates in a gallery that hjas no com- ''^^"'^* In'd depths^ 



munication with the rest of the mine, and in with renjark*. 



yfhiCh consequently tVjfive is no current of 

 air. 



2. Here the thermometer immersed in a lit- 

 tle stat^nant water on the ground rose to .... S2'2^ 228* .6 



3. I then ascended to the former gallery, 

 and under a strong infiltration, in the water, 

 and in a jjlace traversed by a cun-ent of air, 



the thermometer iudicated 54*9^ 195, 10 



I then directed my course to the south, 

 where the present workings are. 



4. At the second gallery, at a little distance 

 from the main shaft, in a place where people 

 are continually passing, and where there was 

 a pretty Strong. current of air, a httle stagnant 



vrater indicated .« 57.00 261 



.5. At the iil'th gallery, the thermometer im- 

 mersed in a reservoir of water, which was near 

 ^he main shaft, rose to 6v)'8° 457 



6. At the extremity of the gallery, No. 9^, 

 the part where the works are farthest ad- 

 vanced in a southerly diiection, a large quan- 

 tity of water, slightly vitriolic, spouts from 

 the rock. The thermometer, kept a quarter 

 of an hour in the midst of this stream, con- 

 stantly marked 65*7° 750 



7. Held on one side of it, in the open air, it 

 equally gave the sanje temperature ........ 65' 7° 750 



8. Tt was the same about sixty paces to- 

 ward the shaft, when immersed in the middle 

 of the rivulet formed by the spring just men- 

 tioned 65*7*=' 750 



The bottom of the mine was inundated, the 

 vater lying on it about 16 met. [52 feet] deep: 

 and by a small shaft, at a little distance from 

 the main shafts I descended to the level of this 

 subterranean lake. 



9. The thermometer, kept a quarter of an 



hour 



