324 Mr Galbraith's Barometric Measurements of Heights. 



Approximate height or difference, (Brought over,) 11290.3 

 t-\-t' = 135" gives factor (Table III.) reversed, . . . 6180.1 



112903 



9032 



113 



67 



Product, 12211.5 



To latitude 28i°, and height 12211 feet, Table IV. gives + 56.5 



True height of tJie Peak of Teneriffe, .... 12268.0 

 2. B = 29.339, r = 66°.2, t = 63°.7 



b = 27.745, t' = 55 .1, t! = 55 .4 



T— r/=ll. U+^'=119.1 



B = 29.300 gives in Table I., 19631 feet. 



30 prop, parts, +27 



9 +8 



29.339 19666 



I = 27.000 gives 18161 



40 ... 38 



5 ... 5 



t_t'=11°.1 29 



18236 18236 



Approximate height or difference, . . 1430 feet. 



t + t' =i 119.1 gives factor (Table III.) reversed, . . . 2360.1 



1430 



86 



4 



Height of the upper barometer above the lower, nearly . 1520 feet. 



Height of the upper barometer above the Calton Hill barometer, 



nearly . 1520 feet. 



To latitude 56", and height 1520, Table IV., ... +3 



Calton Hill above the sea, + 355 



Carnethy Cairn height, 3 



Total height, . 1881 



Or about two feet more than that found by the formula. 



The correction from Table V. is insensible in these examples. 



Having been desirous of applying the symplesometer to the 

 determination of this height, the following observations Avere 

 made with two instruments ; one the same which I had carried 

 without injury some hundred miles, and had used on Ben Nevis 

 in August last, was made some years ago, and had not been 

 examined since by the maker ; the other was quite new, and 

 indicated, as will be seen by the following observations, a con- 

 stant difference of 4 or 5 fathoms. Designating the former by 



