the velocity of sound, made in Holland. 445 
Experiments on the velocity of sound, made the z^th June, 1823 . 
I. 
II. 
III. 
Sound travelled 
Sound travelled from 
from Kooltjesberg 
Zevenboompjes to 
to Zevenboompjes. 
Kooltjesberg. 
// 
// 
1 
52,90 
51,17 
3 
52,69 
50,89 
4 
52,71 
50,68 
5 
52,92 
50,80 
6 
52,84 
50,86 
7 
53,04 
50,89 
8 
52,89 
51,01 
9 
52,79 
51,00 
11 
52,83 
50,99 
12 
52,77 
50,96 
13 
52,79 
51,10 
14 
52,99 
51,07 
16 
52,90 
51,08 
17 
52,64 
51,28 
18 
52,90 
51,21 
19 
52,87 
51,18 
20 
52,92 
51,33 
22 
52,91 
51,38 
23 
52,64 
51,35 
24 
52,57 
51,32 
25 
52,90 
51,14 
26 
52,96 
51,01 
1162,37 
1123,70 
1123,70 
2286,07 
— 0 ' , yo. 
2286,07 
44 
Thus, taking the mean of all the observations, we have the 
velocity with which sound travelled along our basis free ©f 
