Whitney as Site for Meteorological Observatory. 99 



On September 2, 3, 4, 5, 6, 1881, Professor Langley 

 had a very accurate and careful series of eighteen simul- 

 taneous observations taken at Lone Pine and Mt. Whit- 

 ney and published in his "Researches on Solar Heat." 

 His barometers were carefully compared, and his tem- 

 perature and hygrometer observations were made by ex- 

 perienced observers, so that the accuracy of the work can 

 hardly be questioned. In 1900 Mr. Gannett deduced from 

 railroad-levels the elevation of Lone Pine at 3,661 feet 

 above sea-level, but in 1881 the height of Lone Pine was 

 given by Mr. George Davidson to Professor Langley as 

 3,760 feet, or nearly 100 feet higher. The means of 

 eighteen simultaneous observations at the two points are 

 as follows: — 



Using the height of Lone Pine, as given by Mr. Gan- 

 nett in 1900 (3,661 feet), and the barometric observations 

 of Professor Langley, I make the height of Mt. Whitney 



Professor Langley, in his report, using 3,883 feet for 

 Lone Pine and his own barometric work, says Mt. Whit- 

 ney, by barometer observations, is 14,625. 



Professor Langley, by using Davidson's altitude 

 (3,760 feet) for Lone Pine and barometer observations 

 at Mt. Whitney, makes the height 14,522. 



On August 17 to September 7, 1881, Professor Lang- 

 ley had sixteen simultaneous observations taken at Lone 

 Pine and Mountain Camp to determine the height of the 

 camp. To see how we agree on that height I herewith 

 give the data : Using Davidson's height of Lone Pine 



LONE PINE. 



Pressure 26.018 



Temperature 69.57 



MT. WHITNEY. 



Pressure 



Temperature 



17.586 

 37-20 



14,423- 



