. eafily be found: For the line CB in the HyberboUy whereof 
the .^r^'^.rdefign theT^W^r L^^g'^m^;^/, being 0,0144765; 
tVill be, as 0,0144765, to the difference of the Loga-- 
fithms of 5 o, and any other ielTer Number, fb 900 feet or the 
fpace anfwering to an Inch of Mercury y if the Air were e- 
qually preft with 30 Inches of Af^r^/vrj/ and every where a- 
like, to the hight of the Barometer in the Jir^ where it will 
ftand at that lefTer Number of Inches: And by the converfe 
of this proporion may the hight of the Mercury be found, 
having the Altitude of the place given. From thefe Rules I 
derived the following Tables. 
A Table (hewing the Altitude j 
to given hights of the Mer- 
cury. 
Inch 
30. 
29. 
28. 
27. 
26. 
25. 
20. 
10, 
5- 
I. 
b 
o 
Feet. 
o, 01 
- - - - 915. 
_ _ _ _ 1862. 
- — — — 2844. 
- lS6i. 
- — — — 4922. 
- 10947. 
- - - 18715. 
- — — 29662. 
- - - 48378. 
- - - 9183I. 
~ - - 1^0547- 
— — 129262. 
29 mil. or 1 54000. 
41 mil. 2 16 169. 
^^mil. 278338. 
.5- 
I. 
O, 001. 
A Table /hewing the hights of 
the Mercury, at given Al- 
titudes. 
Feet. 
Inch. 
1000. — 
— 28, 91. 
2000. — - 
-27,86. 
3000 — 
-26,85. 
-25,87. 
4000 — 
5000 feet 
-24, 93. 
I ?nile 
-24, 67. 
2 — 
—20, 29. • 
-16.68. ; 
4 - 
—13. 72. 
5 - 
—II. 28. 
10 — 
— 4. 24. 
15 - 
— 1. 60. 
20 
- 0.95. 
25 ^ 
— 6.23. 
30 ^ 
— 0. 08. 
40 - 
— OJ 2. 
?0 — 
Up- 
