208 Proceedings of Indiana Academy of Science. 
TABLE II—Continued. 
tee Diameter and Velocity 
Observer Method Frequency Material of Tube || aalyjeee: 
J. Muller. Ann. d. Phys......... Kundtistubes:s....cs- 903 .3872 em. Glass....| 317.2 
B 11, s 331. 1903. 903 .678 cm. Glass....| 322 9 
902 1 552\em: Glassy. sa|eoeieo 
2,482 .372 em. Glass....| 323.0 
.678 em. Glass....] 325.4 
1.552 em. Glass....| 330.2 
Sehulze. Ann. d. Phys.......... Quincke’s double tube 384 .101 cm. Glass....| 258 
B 13, s 1060. 1904. 384 .151 cm. Glass....| 282 
512 .101 em. Glass....| 265 
512 .151 em. Glass....]| 290 
384 .099 em. Brass....} 189 
384 .148 em. Brass....| 280 
512 .099 em. Brass....} 208 
512 .148 cm. Brass....} 253 
512 .150 em. Rubber..| 195 
In Table II, I have tabulated some of the results obtained by a few 
of the many observers who have determined experimentally the velocity 
of sound in tubes. The results shown are not uniform, but in general 
they tend to show that— 
(1) The velocity of sound in tubes is less than in free air. 
(2) The smaller the tube the smaller the velocity. 
(3) The higher the frequency the less the retardation. 
(4) The velocity depends more or less upon the material of the 
walls of the tube. 
(5) The greater the intensity of the sound the greater is its 
velocity. 
The last-named conclusion is not drawn from Table II, but from the 
original papers there referred to. It must be said, however, that the 
observers referred to are not a unit in supporting the five conclusions 
above named. Other observers are equally at variance. For instance, 
Violle and Vautier’ after a study of the velocity of sound in a masonry 
conduit 3 m. in diameter, the sounds being produced by various musical 
instruments and ranging in frequency from 32 to 640, arrived at the 
conclusion that in such a pipe the velocity is constant to within one part 
in a thousand. Rink’s analysis of Regnault’s results, given in Table I, 
would seem to show a velocity independent of sound intensity. 
As a whole, however, the conclusions given are supported by experi- 
1Violle and Vautier. Ann. Chem. Phys. (8) 5. 208, 1905. 
