4 36 Dr. Moll's account of the experiments on 
SECTION IV. 
Calculation of the distance between the stations of Kooltjesberg 
and Zevenboompjes , being the two points where the experiments 
on the velocity of sound were made. 
a. First triangle. 
The distance between Utrecht and Amerfoort Steeples from 
General Krayenhoff’s Survey is i9574 ra ,090. 
Angle UAK= 7237 7,2^ 
A K U = 58 12 40,3 > by mensuration. 
AUKs 491025,2) 
180 o 12,7 
Angle UAK= 72 37 2 ,96 
AKU= 58 12 36,07 
AUK—. 491020,97 
calculating with these angles and UA, the length UK is found 
equal to 2 i 977 m >i- 
