586 Sir george shuckburgh’s Obferva tiorts 
table ii (f> . Giving the approximate height in Englifh 
feet, adapted to the temperature 3i°24 of Fahren- 
heit’s thermometer. 
Height 
of the 
Barom. 
Height. 
Diff. 
Height 
of the 
Barom. 
Height. 
Diff. 
Height 
of the 
Barom. 
Height. 
Diff. 
Inch. 
1. — 
2. — 
3 - — 
4 - — 
5 - 
6.— 
7 -— 
'8. — 
9 * — 
10. — 
11. — 
12. — 
J 3 -“- 
15.00 
Feet. 
90309.0 
72247.2 
61681.8 
54185 4 
48370.8 
43619-9 
39603.1 
.36123.6 
33 ° 54-4 
30309.0 
27823.4 
2555 s - 1 
23472.4 
21541-3 
r 9743-5 
18062 
10565 
7496 
5814 
4761 
4017 
348.0 
3069 
2745 
2484 
2267 
2086 
193 1 
1798 
Inch. 
16. 10 
20 
30 
40 
50 
60 
70 
80 
90 
16.00 
10 
20 
30 
40 
5 ° 
Feet. 
1 957°-4 
19398.4 
19227.5 
1 9 ° 57-7 
18889.1 
18721.5 
18555-0 
18389.6 
18225.2 
1 806 1.8 
17899.4 
17738.1 
17577-7 
17418.4 
17260.0 
I 73 * 1 
172.0 
1 7°*9 
169.8 
168.6 
167 6 
166.5 
165.4 
164*4 
1634 
162.4 
161.3 
160.4 
* 59-3 
158.4 
Inch. 
16.60 
70 
80 
90 
17 00 
10 
20- 
3 ° 
40 
5 ° 
60 
70 
80 
90 
1 8.co 
Feet. 
17102.5 
16946.0 
16790.4 
^635.8 
16482.1 
16329-2 
1 6 1 7 7-3 
16026.2 
15876.0 
15726.7 
! 557 8 -2 
15430.6 
15283.8 
I 5137-8 
14992 6 
I 57*5 
* 5 6 5 
* 55 - 6 
154.6 
1 53 7 
r 5 2 *9 
151.1 
150.2 
149-3 
148.5- 
147.6 
146.8 
146.0 
145.^ 
(f) This table bears Tome analogy to the tables of logiftical logarithms, being 
nothing more than the differences of the logarithms of the height of the 
barometer from the logarithm of 32 inches multiplied by fix%, I have chofen 
the logarithm of 32 for my term, of comparifon, that being the greateft pro- 
bable height that the barometer will ever be feen at, even at the bottom of the 
deepeft mines. Had I taken the mean height of the quickfilver at the level of 
the lea, it is true the numbers in the table would have more truly reprefented 
the heights in the atmofphere, correfponding to the given height of the quick- 
iilver; but then, in computing fmall depths or heights from the furface of the 
iea, we Ihould have been obliged fometimes to have changed the IT ns in the 
operation, which appeared to me lefs convenient. The mean height of the 
barometer at the level of the fea, from 132 observations in Italy and in Eng- 
land, is 30.04 inches^ the heat of the barometer being 55 0 , and the air 62°; 
-fo that the term of comparifon in this table, viz. 32 inches, correfponds to an 
imaginary point within the earth at 1647 ^ eet Eslow the furface of the fea. 
TABLE 
