ow. . B. Rogers on Sonorous Flames. & Ae 
ring sound caused by its striking the glass. This movement of 
the jet is so efficient in bringing on the sonorous state that it 
will compel the flame to sing even in a tube in which it would 
not do so spontaneously in any position in which we could place 
it. Indeed it will often excite the musical vibrations in cases 
where from the unsuitable proportions poms the tube and os 
flame the external sounds used in Schaffgotsch’s oe. beads ‘4 
experiments entirely fail to bring on the acne ie | 
ig. 1, A, represents an ar- ; 
rangement which I have found 1. 734 
well suited for this experiment. rF 
The jet-pipe, about ten inches _ ] 
long, has an aperture above of 
Path of an inch in diameter, and 
is attached to the metal gas- -stand 
beneath by a piece, of rather 
varied in speed and restricted 4 in 
as we desire. 
e jet-pipe in its vibra- 
ns to strike the sides of the 
ce hich althoug 
= be observed to ase 
n of thé included column 
remarkable effect, the excitement « 
the musical condition in oF the flame by simply moving it to and 
Ye the tube, cannot be thus explained since 
gentle mpulses fe to the air by the es Pipe Epsgey soe 
