BAROMETRICAL MEASUREMENT OF HEIGHTS. 



Table I. gives for h 29.272 inches, 

 " " for h 1 = 24.030 " 



Difference, 



Table II. gives for r r' = 



28,061.00 

 22,905.60 



5,155.40 

 37.64 



Approximate difference of level, D = 5,117.76 

 64) 5118X58.6 



~~~ 



900 



Second approximate difference, D' = 5,450.95 



Table III. gives for D' = 5450 and Lat. 44 . . 0.50 



Table IV. gives for D' = 5450 .... 14.94 



Table V. gives for h = 29.27 .... 0.00 



Barometer below summit, . . 1.00 



Mount Washington above Gorham, or . . Z = 5,465.39 



Barometer at Gorham above sea level . . 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 1 - 64 = 56.7 F. 



. 23,870.4 

 22,502.4 



1,368.0 

 6.3 



= 85.8 



Difference, . 

 Table II. gives for r 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 . Z = 1,453.2 



Mountain House above the sea .... 5,248.4 



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



37 



