Mr W. Galbraitirs Barometric Observations. 47 



Fort-William, and on the top of Ben Nevis, to determine its 

 height alx)ve the sea. 



B = 30.000 r = Sl^.S / =s 52M 



b = 25.466 t' = 37 .7 <' = 37 .0 



8 — 6= 4.534 r — t'=13.8 t — t'=S9.l 



B + 6 = 55.466 3 GO 



41 .4 5346 



Constant 48000 



Correct co-efficient 63346 



B — 6 reversed 435-4 



213384 



26673 



1600 



213 



B + 6 66.466) 241870 ( 4360.9 



221864 — 41.4 



+ 60.8 



20006 



16640 4370.3 = H 



3376 

 3327 



49 

 49 



Example IV. 

 The same by the sympiesometer. 

 S' = 155 fath. t = 5i° 



S = 858 fath. ^ = 38 



S — S' = 703 fath. t-\-f = 92 and m = 1-033. 



Whence 703 x 1033 x 6 = 4357 feet. 



Correction for height above 1 _ ^i 

 the sea, at Fort- William, j *•• — + ^^ 



Height of Ben Nevis = 4408 feet above tlie sea. 



Former height := 4370 



Difference. 38 



A small quantity in so considerable a height, considering the 

 simplicity of the last method. 



