60 
OBSERVATIONS FOR DETERMINING THE HORARY OSCILLATIONS, ETC. 
Data* from which Table No. 3 of corrections for the horary oscillations of the barometric column 
. has been deduced. 
Date. 
7 A. M. 
• 
£ 
< 
CO 
! 
9 A. M. 
! • 
10 A. M. 
11 A. M. 
12 M. 
1 P. M. 
2 P. M. 
3 P. M. 
4 P. M- 
5 P. M. 
6 p. M. 
7 p. M. 
8 P. M. 
1855. 
November 17. 
(29.597 
(29.602 
29.604 
29.592 
29.568 
29.538 
29.525 
29.503 
29.489 
29.474 
29.475 
29.479 
(29.485 
29.492 
November 18 . 
29.487 
29.491 
(29.494 
29.482 
29.462 
29.458 
29.433 
29.427 
29.417 
29.422 
29.425 
29.443 
29.465 
(29.485 
November 19... ... 
29.564 
(29.566 
29.567 
29.566 
29.549 
29.514 
29.493 
29.484 
29.484 
29.488 
29.497 
(29.512 
f29.530 
(29.545 
Hourly mean. 
29.549 
29.553 
29.555 
29.547 
29.526 
29.503 
29.484 
29.471 
29.463 
29.461 
29.466 
29.478 
29.493 
29.507 
Grand mean .. 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
29.504 
Horary correction. 
— .045 
— .049 
— .051 
— .043 
— .022 
+ .001 
+ .020 
+ .033 
-f .041 
+ .043 
+ .038 
+ .026 
4- .nil 
- .003 
* These data consist of hourly barometric readings, taken at Fort Reading, Cal., and reduced to what they would have been had the temperature 
of the mercury been 32° Fahr. Barometer used, No. 1060. 
( The reading at this hour was omitted. This assumed value has been found by careful interpolation from the constructed daily curve. 
