There's a new translation and guide to the Principia that
reflects some of the newer Newton scholarship:
The Key to Newton's Dynamics : The Kepler Problem and the Principia :
Containing an English Translation of Sections 1, 2, and 3 of Book One
from....
(long title truncated by my search)
by J. Bruce Brackenridge , Mary Ann Rossi(Translator) ,
Published by Univ of California Press
Publication date: December 1995
ISBN: 0520200659
I don't have a copy in front of me, but this book has study guides
for current students of mechanics.
(I took sophomore mechanics from Professor Brackenridge, lo these
many years ago...)
JEG
-=================
John E. Gastineau
304 296 1966
Morgantown, WV http://www.badgerden.com/~gastineau
email: gastineau@badgerden.com <==== NEW as of 10/1/96