BAROMETRICAL MEASUREMENT OF HEIGHTS. 



375 



Table I. gives for h = 29.272 inches, . 

 for h' = 24.030 " 



Difference, 

 Table II. gives for r r 1 = 16.38 . 



28,061.00 

 22,905.60 



5,155.40 

 37.64 



Approximate difference of level, D = 5,117.76 

 D X (t -h t' 64) 5118 X 58.6 

 ~900~ -900 



Second approximate difference, D' = 5,450.95 



Table III. gives for D 1 = 5450 and Lat. 44 

 Table IV. gives for D 1 = 5450 . 

 Table V. gives for h = 29.27 



Barometer below summit, 



Mount Washington above Gorham, or 

 Barometer at Gorham above sea level 



0.50 



14.94 



0.00 



1.00 



Z = 



5,465.39 

 825.00 



Mount Washington above the sea, or altitude, . . 6,290.39 Eng. ft. 



Example 2. 



Measurement of the highest peak of the Black Mountain, in North Carolina, July 

 llth, 1856, by A. Guyot. 



By observation we have at, 



Table I. gives for h = 24.934 . 

 for h' = 23.662 



t ' 64 = 56.7 F. 



. 23,870.4 

 22,502.4 



1,368.0 

 6.3 



Difference, . 

 Table II. gives for T r 1 = 2.7 . 



Approximate difference, D = 1,361.7 

 D x (t -+- 1' 64) __ 1362 X 56.7 _ 

 900 900 



Second approximate difference, D' = 

 Table III. gives for D' = 1448 and Lat. 36 .. 

 Table IV. gives for D' = 1448 .... 

 Table V. gives for D' = 1448 and h = 25 



Highest peak above Mountain House, or 

 Mountain House above the sea 



= 85.8 



1,447.5 

 1.2 

 3.8 

 0.7 



Z = 



1,453.2 

 5,248.4 



Black Mountain, highest peak above the sea, or altitude, 6,701.6 Eng. ft. 



35 



