( iSf ) 
/ 
II. Animadverjions upon fome Experiments reletting 
to the Force of 7noVmg Oodles 5 with two new Ex- 
permients on the fame SubjeSi, (By the F(eve- 
rend Dr, Defaguliers, F. S. 
I N a former Paper I demonflrated, by Reafon and 
Experiments, that the Momentum^ or Force of mo- 
ving Bodies, is always proportionable to their Mafs 
multiplied into their Velocity ^ as it is the Opinion of 
the greateft Part of the Mathematicians and Philofo- 
phers. Now I come to conlider the Experiments, that 
have led fome ingenious Men into an Error, in relation 
to this Propolition. Polenus in his Book f gives an 
Account of his Experiments relating to this Matter, 
in thefe Words : “ I took a VelTel, that had in it con- 
“ geal’d Tallow fix Inches deep, and fix’d it to a 
“ level Floor, in fuch manner, that the Surface of 
“ the Tallow, which was flat, fhould every where be 
“ equally diflant from the Floor. I had caufed to be 
“ made two Balls of equal Bignefs, the one of Lead, 
the other of Brafs, the lafl: of which was a little 
“ hollow in the middle, that it might weigh but one 
“ Pound, whilfl: the other weigh’d two. Sufpending 
“ ihefe Balls from the Ceiling by Threads, in fuch 
“ manner, that the lighter Ball hung over the Surface 
“ of the Tallow, from twice the Height that the hea- 
“ vier Ball did I cut the Threads, and the Balls fal- 
“ ling perpendicularly upon the Tallow, by their 
* Philofoph. Tranf, 3 SIo. 375. f Caftellis, pag. 56. No. 118. 
Zz “Fall 
