Whitney as Site for Meteorological Observatory. 91 



14,898 feet, or exactly the same as the figures given 

 by Gannett. This elevation, however, does not seem to 

 be in accord with the readings, and if the altitude is de- 

 termined on the assumption that the correction applied 

 to the barometer was the same as applied in our observa- 

 tions (a doubtful assumption, it is true), the elevation 

 would be about 13,701 feet, the sea-level pressure on that 

 date being 30.01 inches at the given hour, the value of the 

 mean temperature being 37.5° F., and the corrected read- 

 ing at Mt. Whitney being 17.915 inches. 



Two mercurial barometers were carried from San 

 Francisco to Mt. Whitney summit and read at half-hourly 

 intervals by Professor J. N. Le Conte, University of 

 California, and myself. One of the barometers was the 

 same instrument used by Rabe (Green No. 1554). Our 

 readings on the summit were as follows: — 



SUMMIT OF MT. WHITNEY, JULY 8, I9O3. OBSERVERS: J. N. LE CONTE 

 AND A. G. MCADIE. 



Pacific Time. 



Green, No. 1554. 



Green, No. 1664. 



Barometer. 



Attached 

 thermometer. 



Barometer. 



Attached 

 thermometer. 



9:30 a. m 



10:00 a. m 



10:30 a. m 



11:00 a. m 



11:30 a. m 



12:00 noon .... 

 12:30 p. m 



1:00 p. m 



Inches. 

 17.630 

 17.638 

 17.646 

 17.650 

 17.650 

 17.650 

 17.652 

 17-654 



°K 



51 



51 



55 



55 



50 



49 



48 



49-5 



Inches. 

 17.652 

 17.652 

 17.660 

 17.660 



17.668 

 17.674 

 17.674 



°r. 

 54 

 55 

 55 

 54 

 52 

 51 

 54 

 53 





17.646 

 — 0.036* 



51-7 



17.663 

 — 0.041* 







17.610 

 -1- o.o88t 





17.622 

 4- o.o68t 







17.698 





17.690 





* Reduction to standard temperature. 



t Sum total of the probable instrumental error, scale correction, capillarity, 

 and gravity corrections for latitude 37° and for altitude 15,000 feet. 



