432 M. de luc’s Barometrical Obfervations on 
coming out of the mines, my Barometer, after the cor- 
rection for the Thermometer, was much at the fame 
point as when I went in. 
I had not made any obfervations in the mines before 
this firft variation, fo I will look upon a 6 in. 3 1. as 
being the height of the Barometer at the top of the pit 
of the Dorothy during my obfervations in the internal 
part of the mines till three o’clock. But at fix o’clock I 
lhallfuppofe it at 26 in. 3f|. 
At 
tellement qu’au fortir des mines mon barometre, apres la corre&ion pour le ther- 
mometre, fe trouva prefque au meme point que lorfque nous y etions cntres. 
Je n’avois point encore obferve dans les mines avant le terns de cette premiere 
variation : ainfi je regarderai 26 p. 3 1. t|- comme etant la hauteur du barometre 
au haut du puits de la Dorothee pendant mes obfervations dans l’interieur des 
mines jufqu’a 3! h. Mais a 6 h. je la fuppoferai a 26 p. 3 
A 1 h. 
