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410 Scientific Intelligence. 
of the wheel. The pendulum guide should be as light as posst- 
ble, that there may not be much friction at its pivots. I think 
everything farther necessary, and perhaps much that has been 
quite up to a line drawn from the center of the roller to the center 
a 
said, would readily suggest itself to any skillful workman that 
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neutralize the effect of its expansion. How accurate it might be 
made [ am not prepared to say: it would require the pendulum | 
to vibrate in pretty wide arcs. Perhaps the principle might be ; | 
used with advantage in turret clocks in connection with the form . 
f escapement giving impulse in only one direction, which has 
but one remontoire weight. 
sa INN 
SCIENTIFIC INTELLIGENCE. 
I. Cuemistry AND Puysics. 
Esq., D.C.L., F.R.S., &c.—(Proc. Roy. Soc., Phil. Mag., 4th § 
68.)—( 1.) Twenty-fourth Series.— On the possible relation of Gravity 
e employed a cylinder of metal, glass, resins, or other subst 
the other, and endeavored to ascertain wher 
en the latter was” 
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