ASTRONOMY AND BAROMETRIC nYPSOMETRY. i)4'i) 



Observations made at Signal Station, Cheyenne, July 25, 1875, lat. 41° 08'. 

 Observer, A. C. Dobbins, U. S. A. 



iu. ^ " 



Standard bar. laS. 7.00 a.m. 24.270 Att. th. = 61.0 Ex. tb. 58.0 



10.19 24.256 =63.0 02.0 



12.00 m. 24.260 =69.0 65.0 



Reduced to 32°. 24.262 = h 



C 01.6 = t 

 1 59 3 __ ^/ 

 From Guyot's tables we have <J 



[ 120.9 = t+t' 

 Table I for h 24.262 inches = 23,156.7 

 li' 23.168 inches = 21,951.2 



Difference = D = 1,205.5 = approx. diff. level. 

 Bxjt + t'- 64) ^ ^ ^g 2 



900 



D' = 1,281.7 = second approx. diff*. 

 Table III for D' gives + .1 



Table IV for D' gives + 3.0 



Table V for /t = 24.26 + .7 



1,282.5 Harney Peak above Cheyenne. 

 6,085.9 Cheyenne above the level of the sea. 



Feet 7,369.4 Harney Peak above the level of the sea. 



HEIGHT OF TERRY PEAK. 



Observations made on the summit of Terry Peak, lat. 44° 20', August 20, 1875. 



Observer, Hknky Nkwton. 



Bar. 2120 



9.30 a. m. 

 10.00 

 11.00 





in. 



23,404 

 23.408 

 23.420 



Att. 



th. 



o 



= 58.5 

 = 58.5 

 = 60.5 



Ex. 



o 

 th. = 56.0 

 58.0 

 62.0 





3.00 p. m. 

 Qdard 



h' 



23.448 







= 67.5 

 61.2 





61.0 



Means 



Corrected to stai 

 Reduced to 32° 



23.420 

 + .006 

 -.068 



t' = 59.2 





= 23.358 





