472 Experiments on Water Wheels. [Book VII. 



The following table contains the refults of the ex- 

 periments made by M. Deparcieux. He fometimes 

 elevated weights of twelve ounces, and fometimes of 

 twenty-four ounces : the heavieft, refilling the mod', 

 compelled the wheel to turn flower. He wrapped 

 the cords which fupported the weights fucceflively 

 round the different cylinders, and found that che fame 

 weight refilled more in proportion as its cord was 

 wrapped round a larger cylinder. 



When the cord was wrapped round a larger cy- 

 linder, or the elevated weight was more confiderable, 

 the wheel turned flower. It appears from thefe re- 

 fults, .that the fame weight was carried fo much higher 

 according as its cord was wrapped round a larger cy- 

 linder. It appears alfo, that double the weight, which 

 retarded the rotation ftill more, was carried to more 

 than half of the height to which the fingle weight was 

 carried ; in tha,t cafe, therefore, the effect was greater. 



It may be laid down as a principle, that water acts 

 by its weight much more forcibly from the fame height 

 or fall, than by its impulfe ; and that the flower wheels 

 with buckets move, the greater, with the fame expence 

 pf water, will be their effect This augmentation of 

 effect is caufed by the fame quantity of water acting 

 longer, while the wheel moves with lefs velocity. 



