!^4- ^'^''' ViNCE on the Motion of 



of t'he body upon the fame furface^ it is not liable to any inac- 

 curacy of tbe kind which the preceding cautions have been 

 given to avoid, nor indeed to any other, and therefore it niufl 

 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 (ide 33! 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 32 inches in 2'\ and on its edge it defcribed 37 1 

 inches in the fame time. 



Exp. 3. 1 took another body and covered one of its furfaces, 

 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 off fome paper from the middle, leaving only 4- of an incli 

 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 thef^me 

 moving force it defcribed 54 inches in 2''; 1 then took off 

 more paper, leaving only I 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 laft experiments the paper which was taken off 

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

 altered. 



Exp. 



