Proceedings of Societies. 
369 
TQOI 1 
(if thus generated, and the hall walk after hitting) is commonly at or near to the 
crescent point e, though subject to he further removed by the stroke, and the 
power greatest in its nascent state ; whence it declines uniformly, and deviating 
from the line of direction according to the superiority or inferiority of the impelling 
and repelling powers respectively, the ball proceeds, gradually unbending its way, 
as g, h, Sfc. ; but, if the ball moves under an influence of the twisting power, .suffi- 
cient to overcome this forward and rotary effort of the crescent, its agency will 
succeed, and hanging on (as it might he) or attracting the line of reflection, chang e 
the former termination of the parabola into its origin ; and also make the hall 
describe that curve backwards, increasing or decreasing us similar circumstances 
may prescribe 4 . 
Some may suppose, as these crescents are the immediate causes of lateral 
rotation, that the quantity should be as their magnitudes ; but let it be observed, 
it has the progressive to contend with, and that the same means, viz. obliquity of 
opposition, by serving the purposes of both, renders the effect nugatory ; or from 
the eccentricity of its curve, undistinguishable from a right line. 
The parabolic curve is fully evident to a common observer; but the horizontal 
or lateral rotation, whence it partly takes its rise, is not very perceptible ; 
it requires much more quickness of sight to catch the parts of a surface as they 
come and go, if the body be uniform, and the colour or whiteness the same. The 
curious, however, by a close attention to the red ball, (should the colouring not be 
equal,) may frequently perceive it, and the experimentalist may render it still 
more visible by using contrasted colours for that purpose ; hut cv on t ic most 
determined sceptic may he convinced (if a digression will he allowed from el, 
to non-elastic substances, without changing the principle ) by suspending t o 
non-elastic balls, for instance, of clay, or wax, from nearly the same point , 
by drawing one backward to a convenient distance, the other may ,c nt ] 
and afterwards adhere to it : the horizontal or lateral rotation in t us case, can no 
longer be a matter of doubt, nor does it appear how the effect can >e a nue 
any other cause than that already stated. , «kii n „olv 
It has been just shewn, that a ball impelled by a twisting ^ 
against another, will after hitting, describe a parabola backus , but, «f that 
stroke be combined with the means necessary for horizon a m0vecurv ilineally 
cover a tendency to that figure unassisted by any opp0 ^ f ^’ feet> by w hj c b the direct 
the breadth of an inch or two, within the distance o * ^ purpose, the ball 
interposition of another ball may be entirely eu , . , but-end of the cue 
should be struck upon the side, and high »P ** made to circulate 
raised, after the manner e,/, (in fig. d) , am » of about forty-five 
(as it proceeds) in a plane cutting the horizon a 
degrees, producing the above effect. 
(To be continued.) 
VII. Proceedings of Societies. 
X, — Asiatic Society. 
Wednesday , 9th November. _ 
he Honorable Sir Charles Grey, President, m the c „ nan imously elected. 
lr. J. Colvin and Dr. De Noyes were baUotted to _ Cu]Jen on the subject of 
he Secretary submitted a correspondence 
■ Bruce’s legacy. 
deferred to the Committee of Papers. . „ e 115 a llud«. 
The above are the lines of radiation, to which the secon 
