BAROMETRICAL MEASUREMENT OF HEIGHTS. 37^ 



Table I. gives for h = 29.272 inches, . . . 28,061.00 



« for h' = 24.030 "... 22,905.60 



Difference, . . 5,155.40 



Table II. gives for r — r' = 16°.38 ... — 37.64 



Approximate difference of level, D = 5,117.76 



DX{t + V — 64) ^ 5118 X 58.6 ^ ^^^ ^^ 

 900 900 



Second approximate diff^erence, 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 

 11th, 1856, by A. Guyot. 



By observation we have at. 



Barometer. 



Mountain House, h = 24.934 in. 

 Highest Peak, h' = 23.662 " 



Difference, 

 Table II. gives for r — t' = 2.7 



Approximate difference, D = 1,361.7 

 DX (t-hf — 64) _ 1362 X 56.7 _ 



900 - 900 - ^^-^ 



Second approximate difl^erence, D' = 1,447.5 



Table III. gives for D' = 1448 and Lat. 36° . . 1.2 



Table IV, gives for D' — 1448 .... 3.8 



Table V. gives for D' = 1448 and A = 25 , . 0.7 



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. 



D 65 



