466 Mr. smeaton on Mechanic Power. 
the reft; but as the impelling power is adting here upon 
a lever of but half the length, and, confequently, but 
half the intenfity, when referred to the bodies to be 
moved, it takes juft double the time to generate the fame 
velocity therein. 
deduction. It appears from hence, that the fame 
mechanic power is capable of producing the fame velo- 
city in a given body, whether it is applied fo as to pro- 
duce it in a greater or a lefler time ; but that the time 
taken to produce a given velocity, by an uniformly con- 
tinued adfion, is in a iimple inverfe proportion of the 
intenfity of the impulfive power. 
3dlv, The third experiment being made with 2~ turns 
of the lefter barrel, the fame weight in the fcale of 8 
ounces defcending only one quarter part of the former 
perpendicular, the mechanic power employed will be 
only one quarter part of the former, viz. 5 of; but as 
one quarter part of the mechanic power produces half 
of the former velocity in the heavy bodies; that is, they 
make 20 revolutions in 5 8"f ; that is, nearly 10 revolu- 
tions in 29"; we may conclude, in this inftance, that 
the mechanic power, employed in producing motion, is 
as the lquare of the velocity produced in the fame body; 
and that the velocity produced is as the time that an 
impelling power, of the fame intenfity, continues to adf 
upon it,uis appears by the near agreement of numbers 
2 and 3, column 6th. 
4thly, In the fourth experiment, the apparatus t is the 
fame as the firft, only here the weight in the fcale is 32 
ounces; that is, the impelling power is the quadruple of 
the 
