REPRESENTING THE VELOCITY OF SOUND. 
213 
Finally, supposing- V' the velocity of sound observed at a temperature t and 
a tension T, and V" the velocity of sound at zero Centigrade and dry air, we 
have 
= V X J. 
p-i T 
p {t + 0.00375 .*} 
From these formulae the experiments of Messrs. Moll and Van Beek are 
calculated ; the results of which are contained in the following Table. 
A Comparative Table of the Velocity of Sound, as deduced by calculation, 
and obtained by the experiments of Drs. Moll and Van Beek. 
Date. 
Number of ex- 
periments. j 
Veloc. calc, 
from the de- 
termination 
of K by MM. 
Gay-Lussac 
& Welter 
in 1". 
Velocity 
observed 
by Drs. 
Moll and 
VanBeek 
in 1". 
Diff. of Obs. 
and Calc. Ve- 
loc., takingK 
from MM. 
Gay-Lussac 
and Welter. 
Velocity cal- 
culated from 
the determi- 
nation of K 
by M. Du- 
long in 1". 
Difference of 
Observedand 
Calculated 
Velocity tak- 
ing K from 
M. Dulong. 
Value of K 
as deduced 
from the ex- 
periments of 
Drs. Moll 
and Van 
Beek. 
Observed 
Velocity 
reduced to 
0° Cent, 
and in dry 
air. 
DifF. between 
the observed 
reducedVelo- 
city, and the 
mean re- 
duced Velo- 
city. 
1823. 
m 
m 
m 
m 
m 
m 
m 
June27 
1 
335.590 
339.565 
+ 5.025 
341.182 
-1.617 
1.4065 
331.327 
-0.917 
3 
339.477 
341.172 
1.695 
345.133 
-3.961 
1.3885 
329-083 
—3.161 
4 
335.599 
341.799 
6.200 
341.192 
+0.607 
1.4260 
333.497 
+ 1.253 
5 
335.519 
340.711 
5.192 
341.110 
-0.399 
1.4176 
332.515 
+ 0.271 
6 
335.469 
340.777 
5.309 
341.059 
-0.282 
1.4186 
332.629 
+ 0.385 
8 
334.818 
340.721 
5.303 
340.397 
-0.276 
1.4187 
332.634 
+ 0.390 
9 
335.287 
340.810 
5.523 
340.873 
— 0.063 
1.4204 
332.842 
+ 0.598 
12 
335.075 
340.678 
5.603 
340.659 
+ 0.019 
1.4211 
332.924 
+ 0.680 
13 
334.292 
340.154 
5.862 
340.646 
-0.492 
1.4169 
332.424 
+ 0.180 
17 
334.604 
340.055 
5.451 
340.180 
-0.125 
1.4199 
332.783 
+ 0.539 
18 
334.527 
339.435 
4.908 
340.101 
-0.666 
1.4154 
332.252 
+ 0.008 
19 
334.527 
339-631 
5.104 
340.101 
-0.470 
1.4170 
332.444 
+ 0.200 
23 
334.453 
339-827 
5.374 
340.026 
-0.199 
1.4193 
332.709 
+ 0.465 
24 
334.360 
340.154 
5.794 
339.932 
+ 0.222 
1.4228 
333.122 
+ 0.878 
25 
333.933 
339-663 
5.730 
339.498 
+ 0.165 
1.4224 
333.067 
+ 0.823 
26 
334.245 
340.219 
5.974 
339-814 
+ 0.405 
1.4243 
333.301 
+ 1.057 
June28 
4 
335.358 
339.663 
4.305 
340.946 
— 1.283 
1.4103 
331.652 
— 0.592 
5 
334.893 
342.927 
8.034 
340.474 
+ 2.453 
1.4415 
335.032 
+ 2.788 
6 
335.164 
338.200 
3.036 
340.749 
— 2.549 
1.3998 
330.605 
-1.539 
7 
334.971 
337-554 
2.583 
340.553 
-2.999 
1.3961 
329-973 
— 2.271 
8 
334.688 
338.395 
3.707 
340.262 
-1.870 
1.4053 
331.075 
— 1.119 
9 
334.482 
335.440 
0.958 
340.056 
-4.616 
1.3827 
328.386 
—3.858 
10 
334.404 
345.272 
10.868 
339-976 
+ 5.296 
1.4622 
338.090 
+ 6.154 
14 
334.301 
336.911 
2.610 
339.872 
— 2.961 
1.3963 
330.004 
2.240 
15 
334.481 
340.023 
5.542 
340.054 
-0.031 
1.4207 
332.874 
+ 0.630 
17 
334.840 
340.613 
5.773 
340.419 
+ 0.194 
1.4226 
333.094 
+ 0.850 
18 
334.798 
338.233 
3.435 
340.377 
— 2.144 
1.4031 
330.808 
-1.436 
19 
334.941 
339-272 
+ 4.331 
340.522 
-1.250 
1.4106 
331.682 
— 0.562 
Mean number 
1.4152 
332.244 
The preceding table shows how very near M. Dulong’s value of K agrees 
