1 68 . ^' Mr. ViNCE on tie MoUon of 



the found of tlie moving force when it arrived at theflage.. the 

 fpace could be verj accurately adjufted to the time ; tlie ftage 

 v/as then removed to that point to which the moving iorce 

 v/ould defcend in 3'^, upon Aippohtion that the ipaces defcribed 

 hy tlie moving power were as the fquares of the times ; and the 

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

 ftage 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 exactly with the time ; iaftly, 

 the ftage was adjufled to that point to which the moving force 

 ought to defcend in \'\ 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 pofi- 

 tions which correfponded to the above times, the experiment 

 was tried, and the defcent was always found too foon in the 

 former, and too late in tlie latter cafe ; by which I was affured 

 that the fpaces Hrft mentioned correfponded exactly to the 

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

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

 was alfo made ufe of in all the folio wins;. 



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 z'\ 

 upon fuppofition 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 time. 



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

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



ftage 



