File:Miscellanea curiosa. Containing 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 (14595110280).jpg

Identifier: miscellaneacurio11708hall (find matches)
Title: Miscellanea curiosa. Containing 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 knowledge. As also a collection of curious travels, voyages, antiquities, and natural histories of countries; presented to the same society
Year: 1708 (1700s)
Authors: Halley, Edmond, 1656-1742 Hodgson, James, 1672-1755 Derham, W. (William), 1657-1735 Mead, Richard, 1673-1754 Fontenelle, M. de (Bernard Le Bovier), 1657-1757 Royal Society (Great Britain)
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Publisher: London, Printed by J. M. for R. Smith
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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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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