f 39° 3 
but it will every where be greater in the warmer 
temperature. 
The calculation for determining A /3 is obvious 
from the foregoing folution of the problem. For 
putting B for the fubtangent of the Briggian fyftem, 
D for the difference of the tabular logarithms of 
AG, AD, and A for the difference of thofe of / 3 L, 
/ 3 M, we have, 
Therefore, A /3 — D — AX j~ x L iVi . 
Therefore, putting ( 21 u~B ± ~B, and / 3 M— B ± -*B. 
and fubftituting D— A for D in the formula for 
AL, deduced from problem 1, we fhail change 
them into formula for A/ 3 . 
In the example of the preceeding problem 
D = 4,08, and A — 121,817 fathom. Whence 
D — A is negative, and the point B falls above the 
furface, and the preffure was no where the fame* 
but at all heights greater in the warmer condi- 
tion,. 
gLxffMxD 
(by prob. 1.) 
(by cor. 1.) 
— (SLxj3M 
EXAMPLES. 
EXAMPLE 
