Mr. smeaton on Mechanic Power. 461 
MEASURES OF SOME PARTS OF THE MACHINE. 
inches. 
Diameter of the cylinders of lead, or the heavy 1 
bodies, | 2 ?57 
Length of ditto, 1 , 5 6 
Diameter of the hole therein, ,7 2 
Weight of each cylinder 3 lbs. Avoirdupois. 
Greater diftance of the middle of each body 
from the center of the axis, 
The lmaller diftance of ditto, 
1 o turns of the fmaller barrel raifes the fcale, 
5 ditto of the bigger ditto, 
} 8,25 
3.92 
bs>2s 
When the bodies are at the fmaller diftance above fpe- 
cified from the axis of rotation, they are then in effect at 
half the greater diftance from that axis ; for, ftnee the axis 
itfelf, and the cylindric arms of wood, keep an unvaried 
diftance from the center of rotation, the bodies them- 
felves muft be moved nearer than half their former 
diftance, in order that, compounded with the unvariable 
parts, they may be virtually at the half diftance. In 
order to find this half diftance nearly, I put in an arm of 
the fame wood, that only went through the axis, without 
extending in the oppofite direction; one of the bodies 
being put upon the end of this arm, at the diftance of 
8,25 inches, the whole machine was inclined till the 
body and arm became a kind of pendulum, and vibrated 
P p p 2 at 
