436 M. de Luc’s Barometrical Observations on 
Obfervations at the Ramelfberg. 
On the a 8th of Oitober, at 9! h. I obferved 
the barometer under the cover of the entrance 
of the mines, two feet and a half above the I 3 
aperture of the pit, and found it at — J 
At 2| h. when I left the mines, it was at - 2728 
Confequently it had rifen -^ths of a line in five 
hours; whence, not having made any regular obferva- 
tions during this interval, I will fuppofe the variation to 
have been equable, that is, ^th by the hour, during the 
time I flayed in the mines. 
At 
Obfervations faites au Ramelfberg. 
Le 28 OrRobre, a 9J h. du matin, J’obfervai le Barometre fous le-j 
couvert de l’entree des mines, 2^ pieds au defTus- de l’ou-verture du >27 2 3 
puits, et je le trouvai a — — — J 
A 2j h. au fortirdes mines, il fe trouva a — — 27 2 8 
II avoitdonc monte de de lignes en 5 heures; etn’ayant pas eu d’obferva- 
tions fuivies pendant cet intervalle, je fuppoferai la variation graduelle, et ainli 
par heure, durant Je terns cpie je reftai dans les mines. 
