PERPETUAL MOTION 45 



yet there is always a proportionately smaller number of 

 them on that side on which they have the greatest power, 

 so that these circumstances precisely counterbalance each 

 other." 



He then gives the illustration (Fig. 7), shown on the 

 preceding page, of "a wheel supposed to be capable of pro- 

 ducing a perpetual motion; the descending balls acting at a 

 greater distance from the center, but being fewer in number 

 than the ascending. In the model, the balls may be kept 

 in their places by a plate of glass covering the wheel." 



A more elaborate arrangement embodying the same idea 

 is figured and described by Ozanam. The machine, which 

 is shown in Fig. 8, consists of "a kind of wheel formed of 

 six or eight arms, proceeding from a center where the axis 

 of motion is placed. Each of these arms is furnished with 

 a receptacle in the form of a pair of bellows : but those on 

 the opposite arms stand in contrary directions, as seen in 



