the velocity of sound , made in Holland . 
y. Between Kooltjesberg and Zevenboompjes. 
435 
Date. 
No. 
Multiples. 
Repeated 
Angles. 
Single 
Angle. 
r 
1 . 
Double 
O / // 
187 42 30 
93 5 1 15 
2. 
Quadruple 
375 2 7 
93 5i 45 
I 723 - 
3- 
Sextuple 
563 11 30 
93 5i 55 
7 th Aug.<{ 
4- 
Octuple 
75° 45 
93 5° 37 
5- 
Decuple 
938 38 
93 5i 48 
7- 
Duodecuple 
1126 28 
93 5 2 20 
7- 
Quatuordecuple 
1314 6 30 
93 5i 53 
Mean angle 
93 ° 5 1 ' 39 "; 
reduced to centre oi 
station 93 0 45' 7" 
a. Angles taken at Kooltjesberg. 
x. Between the Steeples of Utrecht and Amersfoort. 
Date. 
No. 
Multiples. 
Repeated 
Angles. 
Single 
Angles. 
r 
I. 
Double 
0 , u 
IIO 2? 30 
O / // 
58 12 45 
1823. 1 
2. 
Quadruple 
2 3 2 51 
58 12 45 
8 th Aug.<! 
3 - 
Sextuple 
349 15 3 ° 
58 12 35 
4 - 
Octuple 
465 41 
58 12 37 
t 
5 - 
Decuple 
582 6 30 
58 12 39 
Mean angle 
58 ° 12 ' 40 ", 3 , 
from centre of station. 
13. Between the Steeples of Utrecht and jVaarden . 
r Mean angle 
f 95° 43' 2 5"//> 
V from centre of station. 
Date. 
No. 
Multiples. 
Repeated 
Angles. 
Single 
Angles. 
O / n 
f* 
O / //- 
r 
I. 
Double 
191 27 
95 43 3 ° 
1823. 
t 
2 . 
Quadruple 
382 54 
95 43 3 ° 
8th Aug.-^ 
3 * 
Sextuple 
574 20 30 
95 43 2 5 
4 - 
Octuple 
765 47 
95 43 22 
5- 
Decuple 
957 13 3 ° 
95 43 2 i 
b. Between the Steeples of Utrecht and Zevenboompjes. 
Date. 
No. 
Multiples. 
Repeated 
Angles. 
Single 
Angles. 
O / // 
It 
Double 
103 27 30 
5 1 43 45 
1 
OO 
2. 
Quadruple 
206 55 
51 43 45 
8th Aug.^ 
3 - 
Sextuple 
310 22 
5 1 43 4 ° 
> 
4 - 
Octuple 
413 5 ° 
5 1 43 45 
I 
L 
5 - 
Decuple 
517 l6 30 
5 1 43 39 
J 
Mean angle 
51 0 43' 42'', 8, 
from centre of station. 
