94 



Sierra Club Bulletin. 



mean correction was -|- 0.068 inches. It may be ques- 

 tioned whether this correction properly applies to read- 

 ings at high elevation, but for the present we will assume 

 that it does so. 



We must consider next the various simultaneous 

 base readings. 



Hour (Pacific Time). 



Mount 

 Whitney. 



Indepen- 

 dence. 

 Elevation 

 3910 feet. 



Mount 

 Tamalpais. 

 Elevation. 

 2375 feet. 



San Fran- 

 cisco. 

 Elevation 

 £55 feet. 





17.680 



25-965 



27-55 



29.90 





17.689 



25-953 



27.56 



29.89 



12 noon 



17.701 



25-936 



27.56 



29.88 





17.704 



25.919 



27.56 



29.86 



The above are the so-called station-pressures, — that 

 is, the observed readings corrected for temperature, scale 

 correction, capillarity, and gravity. Independence is the 

 Weather Bureau station nearest to Mt. Whitney, and the 

 observations were made at that point by Mr. Charles C. 

 Garrett. 



The sea-level pressures at Independence and at San 

 Francisco were as follows : — 



Hour. 



Independence. 



San Francisco. 



10 





29.88 



30.06 



II 





29.86 



30-05 



12 





29.85 



30.04 



I 





29.82 



30.02 





Mean 



29-85 



30.04 



The observations at San Francisco and at Mt. Whit- 

 ney are probably the most satisfactory of all, and these 

 we shall proceed to use in determining the true elevation. 



Professor Bigelow's modification of the Laplacian 

 equation, as given on page 490, equation 60, of his "Re- 



