. An Investigation of the Principles of Progressive and Rotatory Motion. By the Rev. S. Vince, A. M. of Sidney College, Cambridge. Communicated by George Atwood, A. M. F. R. S. . a^ and a will be the point required; and by fim. triang. l>c(=.^:^cl%Zv^.fJ^T>o^: r/: :/o (= V) : oa = axGcxFO^P^oxgc^ ^^ ^^^^ ^vr PX.^OXDC-^ ~ imi»i ?» « i»i IIIii«ii»i II I *^^ 2XCi>?philtrans06367833. 31

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Keywords: ., bookcentury1700, bookdecade1780, booksubjectproceed, bookyear1780