: in the Mines of the Hartz. 489 
i'ng to the top of the mine at nine -o'clock: I obierved 
there again, and found the barometer one Sixteenth of a 
line higher than when I had entered. 
Combining thefe obfervations, which are fet down at 
the end of this paper, 1 found that the George gallery 
was 127*15 lachters, or Hartz fathoms, below the en- 
trance of the mine; and that the whole depth was 
21 5*86 lachters, which makes 801 Engliih feet for the 
firlf depth, and 1359 for the latter. 
Mr. uslar, having taken a memorandum of the places 
where I had made my obfervations, afterwards gave me 
the correfpondent geometrical meafures. The depth of 
the George gallery he found to be 127*87 lachters, that 
is, only four feet more than what I had found by the ba- 
rometer.; but I was much furprifed to fee that, in the 
whole 
9heures au haut de la mine, j’y obfervai encore, et je trouvai le barometre plus 
Kaut d’ de ligne que lorfque j’etois entre. 
Cornbinant ces obfervations, dont les details font a la - fin de ce memoire, je? 
trouvai que la galerie George etoit abaiffee de 127,15 lachters, ou toifes da* 
Hartz, au deflbus de l’entree de la. mine; et que la rotulite dc L profondeur 
etoit de 215,86 lachters. Ce qui fait 801 pieds- Anglois pour la premiere pro- 
fondeur, et 1359 pour la derniere. 
Mr. de uslar ayant pris note des lieux ou j’avois falc mes obfervations, me. 
donna enfuite les mefures geometriques correlpondent-es' La profondeur de !a 
galerie George fe trouvoit etre de 1 2 7? 1 7 lachters c ? efi a dire plus grande fern — 
ment-i e 4 pieds qjue celle que j’avois trouvee par re barometre: mais je fus bien, 
