i6S Mr. ViNCE on the Motion of 



the found of the moving force when it arrived at theflage, the 

 fpace could be very accurately adjufted to the time ; the ftage 

 was then removed to that point to which the moving force 

 would defcend in 3'^, upon uppofition that the fpaces defcribed 

 bythe moving power were as the fquares of the times ; and the 

 fpace was found to agree very accurately with the time ; the 

 ilage was then removed to that point to which the moving 

 force ought to defcend in 2''', upon the fame fuppofition, and 

 the defcent was found to agree exaclly with the time ; laflly, 

 the ft age was adjufted to that point to which the moving force 

 ought to delcend in i^\ upon the fame fuppofition, and the 

 fpace was obferved to agree with the time. Now, in order to 

 find whether a difference' in the time of defcent could be ob- 

 ferved, by removing the ftage a little above and below the pofl- 

 tions which correfponded to the above times, the experiment 

 was tried., and the delcent was always found too fbon in the 

 'former, and too late in the latter cafe ; by which I was aflured 

 that the fpaces firft m.entioned correfponded exadtly to the 

 times. And, for the greater certainty, each defcent was repeated 

 eight or ten times ; and every caution ufed in this experiment 

 was alfo made ufe of in all the following. 



Exp. 2. A fecond body was laid upon the horizontal plane, 

 and a moving force applied which defcended 41 1 inches in 3^^; 

 the ftage was then adjufted to the fpace correfponding to 2'^, 

 ■upon fuppoiition that the fpaces defcended through were as the 

 fquares of the times, and it was found to agree accurately with 

 the time ; the ftage was then adjufted to the fpace correfpond- 

 ing to i^\ upon the fame fuppofition, and it was found to agree 

 •with the tim.e. 



Exp. 3. A third body was laid upon the horizontal plane, and 

 amoving force applied, which defcended 59I inches in 4'^ ; the 



ftage 



