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 pressure of 21:42 inches, 

 from the Ferrel psychrometric formula used by the Weather Bureau: 



/ £/_ 39 \ 

 e=e / —0.000ZQ7B(t—t / ) \}+Y&Jl) 



in which t and tf are the temperatures of the dry and wet bulb thermometers in degrees 

 Fahrenheit, B is the barometric pressure in inches, e' is the saturation pressure of 

 aqueous vapor at the temperature / / of the wet bulb, and e is the vapor pressure cor- 

 responding to the thermometer readings. The constants of the formula were deter- 

 mined by Profs. Ilazen and Marvin, of the United States Weather Bureau. 



( 



tf-Si i 



Table 8.— Values of 0.000367 B \ lJ rY57l) when B =- } -"- inches. (Log. 0.000367 



B=7. 89549.) 



175, 



