the Depth of the Mines in the Hartz. 433 
In. L. i6ths of Lines. Log. 
At 1^ h. at two feet' 
from the bottom of the > 27 4 —=5260 37209,857 
well of the Dorothy, 
At the top of the pit, 26 3 13 = 5053 37 ° 35>493 
Difference, — — • 
The thermometer on the outfide of the 
building which is over the mine was at - 2 2 
of my fcale for the dilatations of the air ; but 
this external temperature reached a very little 
way into the mine. At the bottom of the h 
pit the thermometer was -15. I reckon the 
mean temperature — 1 5^-, and confequently 1 
am to deduct from the height found by 
the log, — • — — • 
174)3 
64 
5 » 4°5 
Depth of the Dorothy pit in French toifes, 168,959 
At 
P. L. 16 de Lig. Log. 
Dofothi' * 2 pied i du fond f! uei du e de ,a } 27 4 n = 5260 37209,857 
Au haut du puits, — — 26 3 13 = 5053 37°35>493 
Difference, — — — 174,364 
Le thermometre au dehors du batiment qui couvre la mine etoitl 
a — 22 de mofl echelle pour les dilatations de Pair.- Mais cette | 
temperature exterieure s’etendoit bien peu avant dans la mine. Au * 
fond du puns, le thermometre etoit — 15. Je fuppofe la tempera- j ^ 
ture moyenne — 15J, et en consequence je dois deduire de la 
hauteur trouvee par les log, — — — ~ 
Profondeur du puits de la Dorothee, en toifes de France, — - 1 68 959 
Vol. LXVII. 
L 1 1 
A 3§ h. 
