OF” WAT H RO: MIL L S; Se. 14.9% 
orem for the velocity of the wheel. ‘This, by the coms. 
mon theory would be x= VX PGi which is too little 
by V¥ 3 —VS: No wonder why we have hitherto de- 
rived fo little advantage from the theory. 
Corol. 1. If the weight (W) or refiftance be required, 
fuch as juft'to admit of ‘that velocity which wouid produce : 
the greateft effet; then, by fubfituting £V fori its equi- 
valent x (by prop. IL.) we have }V=Vx1-+%— "5 hence- 
WE DERG? Fy aE! Feo} mt but theorifts make - 
this _ where the error a — 
Corel. 2. W _ rejeGting fric=- 
MR 
tion, T= 7, when the ee “eAheek | 18 produced, inftead : 
of aera as has been fuppofed: this is an important. 
theorem in the conftru€tion of Mills. - 
WM. WARING... 
Philadelphia, 7th, 9th mo. 17902- 
Aftronomical 
