APPENDIX E 
OBSERVATIONS FOR DETERMINING THE HORARY OSCILLATIONS OF 
THE BAROMETRIC COLUMN. 
Data* from which Table No. 1 of corrections for the horary oscillations of the barometric column 
has been deduced. 
Date. 
6 A. M. 
7 A.. >T. 
8 A. M. 
9 a.m. 
10 A. M. 
11a. m. 
12 M. 
1 P. M. 
2 P. M. 
3 P. M. 
4 1>. M. 
5 P. M. 
6 p. M. 
7 1>. 51. 
8 p. K. 
9 P. M. 
1855, 
July 22. 
29.535 
29.527 
29.519 
29.496 
29.484 
29.448 
29.439 
29.418 
29.394 
29.382 
29.376 
29.368 
29.366 
29.377 
29.385 
29.407 
July 23. 
29.526 
29.538 
29.537 
29.532 
29.524 
29.516 
29.507 
29.499 
29.485 
29.463 
29.447 
29.439 
29.440 
29.456 
29.472 
29.489 
July 24 .... 
29.570 
29.580 
29.580 
29.561 
29.546 
29.518 
29.492 
29.465 
29.443 
f29.420 
29.395 
29.379 
29.369 
29.365 
29.376 
29.398 
July 25. 
29.470 
29.464 
29.470 
29.455 
29.441 
29.425 
29.418 
29.406 
29.379 
29.367 
29.355 
29.337 
29.336 
29.344 
29.352 
29.371 
29.477 
29.483 
129.483 
f29.495 
29.478 
29.472 
29.464 
29.445 
129.434 
29.443 
29.423 
29.408 
29.394 
29.384 
29.377 
|29.382 
29.381 
29.395 
29.421 
July 27. 
t’29,489 
|29.495 
29.490 
29.489 
29.474 
29.462 
29.424 
29.407 
29.398 
29.382 
29 378 
29.387 
29.404 
Hourly mean 
29.511 
29.514 
29.514 
29.502 
29.492 
29.474 
29.460 
29.444 
29.425 
29.408 
29.394 
29.381 
29.378 
29.384 
29.395 
29.415 
Grand mean. 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
29.442 
Horary cor’n 
- .069 
— .072 
— .072 
— .060 
— .050 
— .032 
— .018 
— .002 
+ .017 
+ .031 
' 1 
-f .048 -f .061 
+ .064 
+ .058 
+ .047 
-f .027 
* These data consist of hourly barometric readings, taken at Fort Heading, Cal., and reduced to what they would have been, had the temperature 
of the mercury been 32° Fahr. Barometer used, No. 1060. 
f The reading at this hour was omitted. This assumed value has been found by careful interpolation from the constructed daily curve. 
Data* from which Table No. 2 of corrections for the horary oscillations of the barometric column 
has been deduced. 
Date. 
6 A. M. 
7 A. M. 
8 A. M. 
9 A. M. 
10 A. M. 
11 A.M. 
12 >t. 
1 P. M. 
2 p. M. 
3 P. M. 
4 P. M. 
5 P. M. 
6 P. M. 
7 p. M. 
8 p. M. 
9 P. M. 
1855. 
Aug. 27. 
25.926 
25.935 
25.938 
f25.938 
25.927 
25.911 
125.900 
25.890 
25.876 
f25.867 
25.859 
25.861 
25.871 
25.874 
25.896 
25.801 
Aug. 28. 
25.844 
25.835 
25.816 
25.802 
25.787 
25.779 
25.751 
25.746 
25.729 
25.728 
25.724 
25.719 
|25.722 
25.725 
25.735 
25.732 
Aug. 30. 
25.804 
25.810 
25.816 
25.819 
25.816 
25.811 
25.803 
25.800 
25.786 
25.773 
25.771 
25.767 
25.770 
25.775 
25.774 
25.774 
Aug. 31.... 
25.796 
25.804 
25,798 
25.787 
25.778 
25.761 
25.750 
25.743 
25.733 
25.732 
25.748 
25.755 
25.769 
25.780 
25.794 
f25.813 
Sept. 1. 
25.825 
25.823 
25.810 
25.789 
25.768 
25.767 
25.753 
25.746 
25.733 
25.725 
f25.730 
25.747 
25.765 
25.775 
25.792 
25.804 
Ilourly mean 
25.839 
25.841 
25 836 
25.827 
25.815 
25.806 
25.791 
25.785 
25.771 
25.765 
25.766 
25.770 
25.779 
25.786 
25.798 
25.803 
Grand mean. 
25.799 
25.799 
25.799 
25.799 
25.799 
25.799 
25.799 
25.799 
25.799 
25.799 
25 799 
25.799 
25.799 
25.799 
25.799 
25.799 
Horary cor’n 
— .040 
— .042 
— .037 
— .028 
— .016 
— .007 
-f- .008 
-f .014 
+ .028 
-F .034 
+ .033 
+ .029 
+ .020 
-F .013 
-F .001 
— .004 
* These data consist of hourly barometric readings reduced to what they would have been, had the temperature of the mercury been 32° Fahr. 
Those on August 27 and 28 were taken at camp 37, and the remainder at camp 38. Both these camps were near the head of Des Chutes valley, and 
only about three miles distant from each other. Barometer used, No. 1060. _ 
t The reading at this hour was omitted. This assumed value has been found by careful interpolation from the constructed daily curve. 
