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 . Mifcellanea Curiofa. 35^ any Colour may be calFd Faults • the one, anover-careful acknowledgment of every** Triflethe Author had receivd from others ; andthe other that he labours to make
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 . Mifcellanea Curiofa. 35^ any Colour may be calFd Faults • the one, anover-careful acknowledgment of every** Triflethe Author had receivd from others ; andthe other that he labours to make eafie thiscurious Subject, fo little underftood by moll,in a manner perhaps too familiar for the LearnedCritickjt and which demonftrates that it was writcum ammo docendi^ both which require but verylittle Frienfliip or good Nature in the Reader, topafs for Vertues in an Author. But to return to our firft Theorem, whichaccounting for the thicknefs of the Lens, we willhere again refume, viz* m p d r g — ndft-l-nprft m d r ?+ m d $—m p r %—m-+-n d t-^nr t And let it be required to find the Focuswhere a whole Sphere will collect the Beamsproceeding from an ObjecT: at the diftance d:Here t is equal to % r, and r equal to?. And afterdue Reduction, the Theorem will ftand thus, -~ — : — = /j but if d be 2 n a ~r Zn r — m p r Infinite, it is contracted to m $ r. — r ~ z n r t== f, wherefore
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