96 



Sierra Club Bulletin. 



READING OF BAROMETER NO. 20l8, SIGNAL SERVICE, ON THE SUMMIT 

 OF MT. WHITNEY. 



Date. 



Time. 



Reading. 



Attached 

 thermometer 



Reading.* 



1881. 





Inches. 



° F. 



Inches. 



September 2 . . . 



6:00 p. m. 



17.600 



30.0 



17-599 



2 . . . 



9:00 p. m. 



17-597 



26.5 



17.603 



2 . . . 



12 midn't 



17-569 



25-5 



17-576 



3 • • • 



3:00 a. m. 



17-529 



22.5 



17-540 



3 • • • 



6:00 a. m. 



17.518 



22.5 



17-529 



3 . • • 



8:15 p. m. 



17-514 



28.2 



17.516 



4 . . . 



8:30 a. m. 



17.627 



52.8 



17-591 



5 • • • 



12:40 p. m. 



17.600 



62.5 



17-546 



5 . • • 



5:07 p. m. 



17.680 



61.5 



17.628 



5 . . . 



6:30 p. m. 



17.640 



42.0 



17.622 



5 . . • 



8:20 p. m. 



17-599 



38.0 



17.588 



5 . • ■ 



10:22 p. m. 



17-558 



32.0 



17.555 



5 . . . 



12 midn't 



17-558 



31-5 



17.555 



6 . . . 



1:00 a. m. 



17.610 



30.0 



17.610 



6 . . . 



3:00 a. m. 



17.610 



30.0 



17.610 



6 . . . 



5:00 a. m. 



17.610 



28.0 



17.613 



6 . . . 



8:17 a. m. 



17.692 



52.0 



17.657 



6 . . . 



9:00 a. m. 



17.680 



54.4 



17.640 



Professor J. N. Le Conte, on July 8, 1903, made 

 measurements of the height by angles of elevation and 

 depression between Old Camp Independence, Lone Pine, 

 and the Peak and return, and obtained a result of 14,470 

 feet.t 



Historical N otes.% — The mountain was first seen from 

 Mt. Brewer by members of the Geological Survey of 

 California, Brewer, King, and others, in 1864, and named 

 Mt. Whitney. On August 18, 1873, John Lucas, C. D. 

 Bigole, and A. H. Johnson, climbed the peak and called 

 it Fisherman's Peak. On September i, 1873, Clarence 



* Corrected for temperature and reduced to Signal Service standard, but not 

 for gravity. 



t But this depends upon the height of Lone Pine depot ; and this in turn upon 

 the elevation of Mound House on the Virginia and Truckee Railroad. 



t References: Langley —" Researches on Solar Heat." Wheeler — "Surveys 

 West of One Hundredth Meridian, 1889." Stewart— ^j?. Whitney Club Journal, 

 Visalia, Cal. Le Conte — Sierra Club Bulletin. 



