Moving Force. 115 
men, in the application of the prevailing doc- 
trines of moving forces; in the hopes that 
others, better qualified for the task, may be 
prevailed upon to reconsider the subject, and 
remove the obscurities in which some. parts of 
it appear to be involved. 
{ shall first briefly describe some particular 
cases where these difficulties occur, divesting 
them as much as possible of all complicated 
circumstances; and I shall be careful to state 
such facts only as will be readily admitted by 
any one moderately acquainted with the sub- 
ject. Iwill then quote, from approved writers 
on mechanics, such observations as appear to 
have been given in explanation of the points 
in question, accompanied with some remarks 
which they seem to require; and I shall con- 
clude, by venturing to offer some farther 
explanations, which appear to me to be capable 
of general application in mechanics. 
‘ Examples of Force producing Motion in 
* Bodies from a State of Rest. 
1. If two balls, A and B, (figure 1.) whose 
masses are as 1 to 4, be suspended like pendu- 
lums; and if they be set in motion by two 
equal weights, C and D, acting on them by 
means of the bent levers, E and F, whose 
P2 
