Mathematical elements of natural philosophy, confirm'd by experiments : or, An introduction to Sir Isaac Newton's philosophy (1747)

Gravesande, Willem Jacob 's, 1688-1742, Desaguliers, J. T. (John Theophilus), 1683-1744, tr, Adams, John, 1735-1826, former owner. BRL, John Adams Library (Boston Public Library) BRL · London : Printed for W. Innys, T. Longman and T. Shewell, C. Hitch ..., and M. Senex ... · leaf 302

An illustration from Mathematical elements of natural philosophy, confirm'd by experiments : or, An introduction to Sir Isaac Newton's philosophy, 1747, leaf 302 — dtruncated Cone is joind to the Hole without the Chamber, to in-clude the Light, which does not come from, the Objeds to be repre- * 3060. fented *. 3310. Something like this we demonftrate with regard to near Objeds.Plate 107. Let R be the Radiant Point, R C ^ a Ray running diredly againftFig. I.… … ♦. Chap. 16. of NaturalPhilofophy, 21^ Scholium, is found by this Proportion: Let e be the Focus of pa-rallel Rays *, as R^ is to R ^, fo is a e to af; if/ becomes the * 3297,Radiant, R will be the Focus, which is found in the fame man-ner ; for from that Proportion we deduce this, fe is to fa as a…

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