I*'^ Mr. V'iNCE on the Motwn of 



of the body upon the fame furface, it is not liable to any Inac- 

 curacy of the kind which the preceding cautions have been 

 given to avoid, nor indeed to any other, and therefore it mud .[ 

 be perfectly conclufive. In the following experiments the 

 cautions mentioned above were carefully attended to. 



Exp. I. A body was taken whofe flat furface was to its edge 

 as 22 : 9, and with the fame moving force the body defcribed 

 on its flat fide 33 1 inches in 2'\ and on its edge 47 inches in 

 the fame time. 



Exp. 2. A fecond body was taken whofe flat furface was to 

 its edge as 32 : 3, and with the fame moving force it defcribed 

 on its flat fide ^z inches in 2'^, and on its edge it defcribed 35; -§ 

 inches in the fame time. 



Exp. 3. I took another body and covered one of its furfaceSj 

 whofe length was 9 inches, with a fine rough paper, and by 

 applying a moving force, it defcribed 25 inches in 2''' ; I then 

 took ofi^ fome paper from the middle, leaving only 4- of an inch 

 at the two ends, and with the fame moving force it defcribed 

 40 Inches in the fame time. 



Exp. 4. Another body was taken which had one of* its fur- 

 faces, whofe length was 9 inches, covered with a fine rough 

 paper, and by applying a moving force it defcribed 42 inches 

 in 2^^ ; fome of the paper was then taken off from the mid- 

 dle, leaving only i| inches at the two ends, and with the fiime 

 moving force it defcribed 54 inches in 2''; 1 tlien took ofi 

 more paper, leaving only | of an inch at the two ends, and 

 the body then defcribed, by the fame moving force, 60 inches 

 in the fame time. 



In the two lafl: experiments the paper which was taken off 

 the furface was laid on the body, that its weight might not be 

 altered. 



Exp. 



