Mountain Sites for Meteorological Observatories, ii 



greatly in error if we assume that the boiUng-point on 

 the summit is about i86°.8, and the equivalent pressure 

 17.73 inches. A sling psychrometer gave the following : — 



Dry, 37°.oR 36°.4 36°.5 3^°-S 37°-o Mean, 36°. 7 

 Wet, 32 .0 28 .0 25 .0 24 .2 25 .5 " 26 .9 



The dew-point was approximately 10°, vapor tension 

 0.07 inch and = .0004. 



ELEVATION OF MT. SHASTA. 



Summit of Mt. Shasta, August 5, 1905, 12 noon to 

 1 130 p. M. ; six readings, 17.988, 17.990, 17.992, 17.977, 

 17.962, 17.980 inches. Mean pressure, corrected for 

 temperature, instrumental error, and gravity, 17.993; 

 mean temperature air column, 60° F. Sea-level readings, 

 Eureka, San Francisco, 30.000 inches. 



h = 63958 X 0.222017 = 14,200 feet. 



The boiling-point at the summit was 86°. 5 C. 

 ( 187^.7 F.). Equivalent pressure, 18.080 inches. 



The height of Shasta given on the Geological Survey 

 sheet is 14,380 feet (intended for 14,389 feet) ; but this 

 elevation was determined more than twenty years ago 

 by combining the results obtained by vertical angles 

 and mercurial barometers. In a letter dated August 

 24, 1905, the Acting Director of the Survey states that 

 " doubt is thrown on the value from the fact that an 

 exact elevation of the base station was not known, and 

 the methods used would now be considered only ap- 

 proximate." 



MISCELLANEOUS OBSERVATIONS. 



The following table of boiling-points may be inter- 

 esting. It should, however, be noted that a strong wind 

 was blowing when the readings were made at Mt. Rainier 

 on the south rim of the crater. 



