340 W. E. Geyer—A new Sensitive Singing Flame. 
2°85 r. For this and every less value of ~~ the effective action 
is repulsive at all distances between the molecules. In proportion 
as the value of = is greater than 4-938, the maximum attrae- 
tion, bm, is greater, the range ac of attractive action greater, the 
distance Oa smaller, and the distance Od greater. Oa ran 
from 2°85r to 0°5r; ac from 0 to 19°5r, and Od from 7r to 80r. 
The value of ab is nearly 0°5r, for all the values of — consid- 
ered, excepting those differing but little from 4-938. The value 
of the maximum attractive ordinate, bm, varies from 0 to 
0-73 3 ; and that of the maximum repulsive ordinate, dn, from 
0-0042 = to 0-00032 ; the latter value of dn answering t0 
the greatest assumed value of -, At the distance 80r the re- 
pulsion becomes very nearly the same for all the assumed val- 
ues of ~ viz, 0:00018~. 
(To be concluded.) 
Art. XLIV.—A New Sensitive Singing Flame; by W. & 
GEYER, of the Stevens Institute of Technology. 
as to the e 
A simple addition to this apparatus has given me @ nis 
which, by slight regulation, may be made either : (1) 4 peng 
flame merely ; that is, a flame which is depressed and vege 
non-luminous by external noises, but which does not sine: 
(2) a continuously singing flame, not disturbed by outwar 
be 
__* Nature, v, 30, Nov. 2, 1871. [This form of apparatus would seem not 1 
original with Mr. Barry, since identically the same thing, apparently, was umber 
months earlier by Professor Govi, of Turin, and noticed in the September 
of the Moniteur Scientifique.—Eps.] 
