APPENDICES. 
APPENDIX A. 
VAPOR PRESSURE TABLES— WAGON WHEEL GAP, COLORADO. 
The accompanying table for obtaining vapor pressures from reading of the 
dry and wet bulb thermometers was computed by Mr. B. C. Kadel for a pres- 
sure of 21.42 inches, from the Perrel psych rometric formula used by the 
Weather Bureau : 
e=e'-0.000367B (t-.tf) (l+^y) 
in which t and-/' are the temperatures of the dry and wet bulb thermometers 
in degrees Fahrenheit, B is the barometric pressure in inches, e' is the satura- 
tion pressure of aqueous vapor at the temperature t' of the wet bulb, and e is 
the vapor pressure corresponding to the thermometer readings. The constants 
of the formula were determined by Trofs. Hazen and Marvin, of the United 
States Weather Bureau. 
/ t / —32\ 
Table 8— Values of 0.000367 P * ll + - ■■„— -) -when P =2 1.42 inches, log. 0.000367 
P =7. 89549. 
V 
i+ 1,571 
log. 
+7.89549 
Product. 
-35 
0. 95736 
9. 98107 
7. 87656 
0. 007526 
-30 
. 96054 
9. 98252 
7. 87801 
. 007551 
-25 
. 96372 
9. 98395 
7. 87944 
. 007576 
-20 
.96690 
9. 98538 
7.88087 
. 007601 
-15 
. 9700K 
. 98681 
. 88230 
. 007626 
-10 
. 97327 
. 98824 
. 88373 
. 007651 
— 5 
. 97645 
. 98965 
. 88514 
. 007676 
Zero 
. 97963 
. 99106 
. 88655 
. 007701 
. 98282 
. 99248 
. 88797 
. 007726 
< 10 
. 98600 
..99388 
. 88937 
. 007751 
15 
. 98917 
. 99527 
. 89076 
. 007776 
20... 
. 99236 
. 99667 
. 89216 
. 007801 
25 
.99554 
. 99806 
. 89355 
. 007826 
i 30 
. 99873 
. 99945 
. 89494 
.007851 
35 
1. 00191 
.00083 
. 89632 
. 007876 
40 
1.00509 
. 00221 
. 89770 
. 007901 
45 
1.00827 
. 00358 
. 89907 
. 007926 
50 
1.01146 
. 00495 
. 90044 
. 007951 J 
55 
1.01464 
. 00632 
. 90181 
. 007976 
60 
1.01782 
. 00767 
. 90310 
. 008001 
65 
1. 02101 
. 00903 
. 90452 
. 008026 
70... 
1. 02418 
. 01038 
. 90587 
. 008051 
75 
1. 02737 
.01173 
. 90722 
. 008076 
SO 
1.03055 
. 01307 
.90856 
. 008101 
85 
1.03373 
. 01441 
. 90990 
. 008126 
90 
1.03692 
. 01575 
. 91124 
. 008152 
175 
