meafuring Heights with the "Barometer. 743 
near Spitzbergen, and found it to be 1503 feet above 
the level of the fea. On the morning of the 1 8th of Au- 
guft, the following obfervations, at the fea-lhore and top 
of the mountain, were made with a fingle barometer, 
wherein the quickfilver had not been boiled. 
At 6 h. A.M. Barometer at the fir ore, — ■ — 30.040 therm. 50* 
7 h, 45' A.M. Ditto at the top of the mountain, 28.266 — - — 4^ 
8 h. 45' A.M. Ditto at the top of ditto, — 28.258 — — - 42 
11 h. 45' A.M. Ditto at the fea-fhore, — 30.032 — — - 44 
Whence we have the following computations, equated 
for the times correfponding to the two obfervations at 
the top. 
From thefe obfervations it appears that, inftead of the 
ufual equation to be added to the logarithmic re- 
fult, in order to obtain the true height in Britain, when 
the temperature is 42°, there is an excefs of tIIq: and, 
inftead of the ufual ratio of the weight of quickfilver to 
columns of air, of equal altitude and temperature in 
Britain, namely about moo, we have that of 10224 
to 1. 
Vol. LXVII, 5 G 
Mean 1577.1—+ 47 
1000 
Thus 
