Miscellanea curiosaContaining a collection of some of the principal phaenomena in nature, accounted for by the greatest philosophers of this age; being the most valuable discourses, read and delivered to the Royal Society, for the advancement of physical and mathematical knowledgeAs also a collection of curious travels, voyages, antiquities, and natural histories of countries; presented to the same society . inverted. A Second life is to find what Convexity orConcavity is required, to make a vaftly di-*ftant Objed be reprefented at a given Focus,after the one Surface of the Lens is formed ;whi
Miscellanea curiosaContaining a collection of some of the principal phaenomena in nature, accounted for by the greatest philosophers of this age; being the most valuable discourses, read and delivered to the Royal Society, for the advancement of physical and mathematical knowledgeAs also a collection of curious travels, voyages, antiquities, and natural histories of countries; presented to the same society . inverted. A Second life is to find what Convexity orConcavity is required, to make a vaftly di-*ftant Objed be reprefented at a given Focus,after the one Surface of the Lens is formed ;which is but a Corollary of our Theorem forfinding ?, having /?, d, r and / given ; for d r f being infinite, that Rule becomes —- = ?, ? r — f r f that is in Glafs ——- — ?, whence if f be % r — / greater than x r, § becomes Negative, and r f ????M P* is the Radius of the Concave (ought. f —* 1 r Thoie that are wholly to begin with thisDioptrical Science, cannot do better than toread with Attention a late Treatife of Diop*tricks, publifhed by PV. Molineux^ Efcj, R. S. has at large {hewn the Nature of OptickGlafles, and the Conftru&ion and life of Mi-crofcopes and Telefcopes ; and though (bmenicely Critical have endeavourd to fpy Fault?,and to traduce the Book ; yet having longfince examined it with Care, I affirm, that ifI can judge, it hath but two things that with any.
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