BAROMETRICAL AND METEOROLOGICAL OBSERVATIONS. 181 



adapted for the computation of the altitude of Camp Floyd and points of a similar 



hi the neighborhood of San Francisco, and to tin- Atlantic- roast near the 4<»th parallel 

 of latitude. I thus obtained the altitude of Camp Floyd as 4,867 feet. To test the 

 correctness of tins result,. I computed tin- elevation of Fort Hridger from a mean of S 

 months' observations, taken there from January to August. lXf>!>, under direction ot 

 Asst. Surg. R Bartholow, and, later, of Asst. Surg. K. Kyland, U. S. A. This mean, 

 corrected for the zero error of the instrument, is 2:5.51 3 inches, and 42 n air tempera- 

 ture, which values probably represent very nearly the mean of the year. I thus 

 found the altitude 6,688 feet— 1,791 more 'than that of Camp Floyd, while the mean 

 difference of elevation between both points, determined in various ways, from very 

 careful simultaneous observations, and from large means, is 1,7JM; feet. These results 

 agree very- satisfactorily, and speak for the correctness ot the observations and method. 

 Taking into consideration, moreover, the height of the instruments above the ground, 

 we may assume as well established the altitude of Tamp Floyd (parade ground, near 

 headquarters) as 4,860 feet, and of Fort Bridger (parade ground), as 6,656 feet In 

 these computations, as in the other, the elastic torce ot the aqueous vapor has not been 

 taken into consideration, but La Place's formula has been made use ot, tor the reasons 

 stated above. 



GENERAL REMARKS IN REGARD TO CAMP FLOYD AND THE UTAH BA8IN. 



The reading of the barometer at Camp Floyd varied considerably during the 

 different months. The highest monthly mean was observed in January; the lowest 

 in February. A higher atmospheric pressure seems to prevail in the fall and first part 

 of winter; a lower one in the spring and part of summer; but as the observations 

 have not all been made with the same degree of accuracy, and cover too limited a 

 time, it would be unsafe to draw definite conclusions from them. The subjoined table 

 contains the monthly means, the authorities for which I have stated above (namely, 

 myself, Dr. Williams, and Dr. Moore). It also contains the quantities of rain and 

 melted' snow at Camp Floyd, taken, from 1858 to 1859, from the rec ords of the Medi 

 cal Department of the Army, and at Salt Lake City, from March, 1857, to February, 

 1858, upon the authority of a Mr. W. W. Phelps, a citizen of that pla 





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