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 Ferrel psychrometric formula used by the 

 Weather Bureau : 



( / -32 N 



e =^_0.000367B (t-f) (l + yi^y) 



in which t and t' 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 Profs. Hazen and Marvin, of the United 

 States Weather Bureau. 



Taiu.k 8. 



/ i / —S2\ 

 Values of 0.000367 Pll + ., ) when P=21.4% inches, log. 0.000367 



P=7.89549. 





^'-32 









V 



1+ " 1,571 



log. 



+ 7.89549 



Product. 





0. 95736 



9.98107 



7. 87656 



0. 007526 



-30 



.96054 



9. 98252 



7.87801 



. 007551 



- 25 



,96372 



9.98395 



7. 87944 



. 007576 



-20 



.96690 



9.9S.-.3S 



7.88087 



.007(1111 



■ 15 



.97008 



.98681 



.882! in 



.11070211 



-10 



. 97327 



.98824 



. 88373 



. 007651 



—5 



.97645 



.98965 



.88514 



. 007676 



Zero 



,97963 



.99106 



. 88655 



.()ll77nl 





. 98282 

 ,98600 



.99248 

 . 99388 



. 88797 

 . 88937 



.007726 

 .007751 



10 





.98917 



.99527 



.89076 



.111)7770 



20 



. 99236 



.99667 



.89216 



.007801 





.99554 



.99806 



. 89355 



.007826 



30 



. 99873 



,99945 



.89494 



.007851 





1.00191 



.00083 



. 89632 



.007876 



10 



L. 00509 



.00221 



. 89770 



,007901 





1.00827 



,00358 



. 89907 



,007926 



50 



1,01146 



00495 



.90044 



.007951 



55 



1. 01 164 



.00632 



.90181 



.007976 



• 



1.01782 





,90316 



,008001 





1,02101 



.00903 



.90452 



.008026 





1,02418 



.01038 





..1 





L. 02737 



.01173 



.90722 



.ii 8 







.01307 



6 



,008101 







.mill 





.008126 



■ 







,91124 



.001 i 



