s 
= , 9 *., 
this first impre 
jet 
b, The note which produces the » greaiest shortening of the con 
64 Influence of Musical Sounds on a Jet of Coal-gas. 
of fiuid jets. ince reflection has only served to fortify. | 
The Scie. enacasen of Felix Savart on the jnfluence i 
of sounds on jets of water, afford results presenting so many — 
points of analogy with their effects on the jet of burning gas, 
that it may be well to inquire whether both of them may ‘be Te: 
ferred toa common cause. In order to place this in a otra 
light, I shall subjoin some of the results of Savart’s experim 
Vertically descending jets of water ragelg the following modi 
cations under the influence of vibratio 
€ continuous portions peso shortened ; the vein. re | 
solves itself into separate orp neat er the orifice, than when i : 
under ~ influence of vibratio ; 
of the masses, as ‘dio, detach themselves from the ex: _ 
tremity ee the continuous part, becomes flattened iors in 
a vertical and horizontal direction, presenting to the eye, under 
the influence a their translatory motion, regularly disp ose ] 
series of maxima and minima of thickness, or ventral segments ’ 
and nodes. : 
8. The donegone modifications become much more developed 
and regular, when a note, in unison with that which would be — 
pr by e 
against a stretched membrane, is sounded in its neighborhood. © 
‘The continuous part becomes considerably shortened, and the 
ventral segments are enlarged. 
4, When the note of the instrument is almost in unison, the 
peonucts part of the jet is alternately lengthened and short. 
ened, and the beats which manage with these variations i 
Saath can be recognized by the ear. : 
5. Other tones act with ath energy on the jet, and some pro ql 
duce no sensible effect. 13 
ema jet is made to ascend obliquely, so that the discontim 
ee appears scattered into a kind of sheaf in the same vé 
tical ote M. Savart found :— 
hat under the influence of vibrations of a determinat 
period, this sheaf may form itself mto two distinct jets, each pos 
sessing regularly disposed ventral segments and nodes; some 
times, “with a different note, the sheaf becomes replaced by inne 
tinuous part, always reduces the whole to a single resenting : 
a perfectly regular system of ventral segments wate ac aa 
m the dast memoir of M. Savart—a posthumous one—pre 
sented to the Academy of Sciences of Paris by M. Arago @ 
1853,* several remarkable acoustic phenomena are noticed in 
ven comptes Rendus for August 1858. Also Phil. Mag, 4th series, vol. vii, p. 186, 
ee ‘ : 
