437 
the velocity of sound made in Holland, 
h. 
In triangle UBK, we have now UK = 21977™, 1. 
UBK= 76 46 33,3 
BUK= 51 43 42,8 
B U K — 51 so 14,1 
180 o 30,2 
Thus, UBK= 76 46 23,24 
BKU= 51 43 32,73 
BUK= 51 30 4,03 
With these data we have the distance of the two stations 
of Kooltjesberg and Zevenboompjes 17668,4 metres. 
b. Second triangle. 
Kooltjesberg. 
The distance UA between Utrecht and Amersfoort taken 
from the Survey of General Krayenhoff. 
O / 11 
U A P — 45 41 32,2^ 
AUP= 21 38 o,5> measured angles. 
UPA= 112 40 20,1' 
179 59 52,8 
Thus UAP=s 45 41 34,6 
AUP= 21 38 2,9 
U P A = 112 40 22,5 
