Miftellanea Curtofa. 341 



g (the new Impulfe of Gravity) in each Moment 

 is fuppofed to be the fame. 



31. But what is the Proportion of f to g (that 

 of the Force impreffed, to the Impulfe of Gra- 

 vity in each Body) remains to be inquired by 

 Experiment. 



\%. This Proportion being found as to one 

 known Force \ the fame is thence known as to 

 any other Force (wbofe Proportion to this is gi- 

 ven) in the fame uniform Medium. 



33. And this being known, as to one Medium ; 

 the fame is thence known as to any other Medi- 

 um, the Proportion of whofe Refinance to that 

 of this is known. 



34. If a heavy Body be projected downward 

 in a perpendicular Line ; it defcends therefore at 



the Rate — , - — , -~ 9 &c. of / (the impre£ 

 m mm m 



fed Force) increafed by — , — -f- ~~z->~' h 



mm m m 



— -+» — , &c. of g the Impulfe of Gravity. 



(by 5 7* an d f ^7 ) Becaufe both Forces are 

 here united. 



35. If in a perpendicular Projection upwards ^- 

 it afcends in the rate of the former, abated by 

 that of the latter. Becaufe here the Impulfe of 

 Gravity is contrary to the Force impreffed. 



36*. When therefore this latter (continually 

 increafing) becomes eo.ual to that former (conti- 

 nually decreafing) it then ceafeth to afcend • and 

 doth thenceforth defcend at the rate wherein the 

 latter continually exceeds the former. 



37. In an Horizontal, or Oblique Projection : 

 If to a Tangent, whofe Increments are as F L, 

 Z 3 L M, 



