( !•»■<* ) 
\\. A TABLE Jbtwing the Heights of the Mer- 
cury, at given Altitudes . 
Feet. 0 
30 
00 Inches and Tenths. 
1000 
28 
9 r 
1000 
V 
86 
3000 
2 6 
85* 
4000 
87 
5 °°° 
24 
93 
1 Mile 
24 
67 
2 
20 
29 
3 
1 6 
68 
4 
13 
7 X 
5 
11 
28 
IO 
4 
24 
1 S 
1 
60 
20 
0 
95 ” 
* 5 
0 
2-3 
30 
0 
08 
40 
0 
012 
Now ns very few Mountains in tlie World arc 3 IVIiles 
high, and, generally fpeaking, thole that we look upon 
as high Hills, (except the Andes, and fome others in 
America) are not much above a Mile high; we may, 
for finding the Height of Mountains, take a hxd Num- 
ber of Feet in Altitude to anfwer to every 10th or 1 2th 
of an Inch in the Fall of the Merc ury , becaufe 90 Feet are 
by Dr. Halley only taken for the tirft Tenth, and great- 
er Heights for other Tenths, encreafing with the rail 
of the Mercury. Therefore I wou’d propofe another 
for a round Number, namely 96 Feet for every Tenth, 
and 80 Feet for every 12th of an Incn, very near the 
Number that I have found by my Calculation, which is 
as follows. inc 
