BAROMETRICAL MEASUTIEMENT OF HEIGHTS. 



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 t — r' = 16°.38 . . . _ 37.64 



Approximate difference of level, D = 5,117.76 

 -P X (t-[-t' — 64) _ 5118 X 58.6 _ 

 900 ~ 900 ~ 



333.19 



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 

 11th, 1856, by A. Guyot. 



Bv observation we have at, 



Difference, .... 1,368.0 



Table II. gives for r — t' = 2.7 . . . . — 6.3 



Approximate difference, D = 1,361.7 

 D X (t -h t' — 6i) 1362X56.7 ^_ ^ 

 900 - 900 = ^^-^ 



Second approximate difference, 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 7i = 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 37 



