72 Barometric Measurement rfthe Height of' Cheviot. 



From Sir Thomas Brisbane's and Mr Galbraith's, 



B = 29.849, T = 57.0, / = 57.0 57 



b = 27.O86, T = 44.6, f = 4.4.5 44.5 



B — 6 = 2.763, T — t' = 12.6, t+ t' = 101.5 300)101.5 



B + 6 = 56.935 6 



.34 



2.42 



48400 



2.76 



64490 t + t' z= 12.5 



B -- 6 (inverted) . 367-2 



1380 



108980 552 



38143 276 



3269 



163 —34.500 



B + 6 56,935 ) 150555 ( 2644.5 



113870 —34.5 



m 85 2610.0 

 34161 Sea +59.0 

 Cairn + 15.0 



2524 



2277 2684.0 



247 

 228 



"~19 

 25 + 



Mr R. Adie s and Mr Galbraith's, 



B = 29.699, T = eO^O, 

 b = 27.O86, t' = 44.5, 



Substituting, then, in the formula 



H c= {48400 + 60 (^ + e) ^^^ - 



there will result H = . 

 Height of Mr Adie's barometer above the sea 

 ' Summit of Cheviot above the barometer 



Total height above the sea 2695 feet ; 



which exceeds the other by 11 feet, a quantity not very great, 

 considering the distance, and the weather not in the most fa- 

 vourable state. It shows, however, that even at considerable 

 distances, such as 50 or 60 miles, in this case, as well as in our 

 measurement of the height of Benlomond in 1828, that consi- 

 derable accuracy in the results may be expected, when the ob- 

 servations are carefully made with good instruments. 



