desired) be thus represented by Lines and Spaces. The Ablatives a , ma , mma , &c. (being the same with the first Column taken backward) are fitly represented by the Segments of NF (beginning at N ) in Figure 5 and 6, and therefore by Parallelograms on these Bases, assuming the common height of Fh , or NQ ; the Aggregate of which is Nh , or FQ . And, so many times 1, by so many equal Spaces, on the same Bases, between the same Parallels, terminated at the Hyperbola: The Aggregate of which is hFNQn . From whence if we subduct the Aggregate of Ablatives FY ; the remaining Trilinear hQn , represents the Descent.
- If to this of Gravity, be joined a projecting Force; which is to the Impulse of Gravity as hK to hF (be it greater, less, or equal) taken in the same Line; the same Parallels determine proportional Parallelograms, whose Aggregate is KQ.
- And therefore if this be a perpendicular Projection