Page:Philosophical Transactions - Volume 004.djvu/172

 Numb. 53.

We shall give it in the Authors owne words, as followeth.

Int tria Corpora terendo idonea, P. Q. R; quorum P. & Q. sint æqualia & Columnari forma, R verso Corpus Lenti-forinc. P. rotetur circa axin A B; Q, circa C D; & R, circa E G.