the velocity of sounds , made in Holland . 449 
SECTION VII. 
Experiments on the velocity of sound on 2,8th of June, 1823, 
compared with theory. 
On the 28th of June, 1823, fourteen simultaneous shots 
were equally seen and heard on both stations ; the following 
table contains the results. 
Number 
of shots. 
Sound travel- 
led from 
Kooltjesberg to 
Zevenboompjes 
in 
Sound travel- 
led from 
Zevenboompjes 
to Kooltjesberg 
in 
! 
3 
// 
51,81 
// 
52,12 
4 
51,94 
52,io 
5 
51,77 
51,28 
6 
51,98 
52,51 
7 
52,17 
52,46 
8 
52,15 
52,28 
9 
52,25 
53,10 
IO 
52,18 
50,17 
12 
52,40 
52,19 
14 
52,27 
52,62 
15 
52,27 
51,66 
17 
52,23 
51,52 
18 
52,49 
51,99 
19 
52,56 
51,60 
Sum 
730,47 
727,60 
The mean result by experiment on the 28th of June, 
1823, is - 73 ° ’ 47 y 27 ,6 ° = 52,07, in which time sound tra- 
velled along the basis of 17669,28 metres, or 57988,2264 
MDCCCXXIV. 3 M 
