462 Mr . smeaton on Mechanic Power . 
at the rate of 9 2 times per minute ; and as a pendulum of 
the half length vibrates quicker in the proportion of 
Vi to V2 ; that is, in the proportion of 92 to 130 nearly; 
therefore, keeping the fame inclination of the machine, the 
weight was moved upon the arm till it made 130 vibra- 
tions per minute; which w r as found to be, when it was at 
3,92 inches diftance from the center as above ftated, 
which is about f^ths of an inch nearer than the half 
diftance. The double arm was then put in, and marked 
accordingly, and the bodies being mounted thereon, 
the whole was adjufted ready for ufe; and with it were 
tried the following experiments, each of which was re- 
peated fo many times as to be fully fatisfa&ory. 
table 
