27 
Formula 4. — Phillips, 
(a — a) -0001 -p- a- (iPoo^ = 
(1000 + + if) | A — (A» + »)} 24-9. 
ft +ft> 
(l (* -*' + ») 49800. 
49800 (1 +^) 
A + ft' 
d + d' \ ft — ft' + n 
1000 7 ft H-ft' 
= 2 
The constants when corrected for temperature and gravity become, -when 
calculated for example 1, as follows : for Form. 1, 64900 ; Form. 2, 64920 ; 
Form. 3, 64901, and for Form. 4, 56473. 
EXAMPLES. 
Let h be the height of the barometer at the lower station. 
— ti upper 
a & a be the temperatures indicated by a thermometer attached to 
the barometer. 
d&c d s ■ by a detached thermometer. 
Example l—h = 30*040 a = 72*5 d = 72 
K == 26-575 d = 63*5 y d = 62*6 
According to Form: 1 2 3 4 
the resulting height is 3432 3427 3433 — - 3434 
Example 2. — h = 30*037 a or d = 55 
h y = 28-920 a s or ef = 53 
Form. 1 2 3 4 
1033 1033 1033 1040 
