Download or read book Lives of the Most Eminent Literary and Scientific Men of Italy Spain and Portugal Vol 2 Classic Reprint written by David Brewster and published by Forgotten Books. This book was released on 2018-02-03 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Lives of the Most Eminent Literary and Scientific Men of Italy, Spain, and Portugal, Vol. 2 In a memoir so brief and general as the present, it would be out of place to discuss the history of this ex traordinary invention. We have no hesitation in as serting that a method of magnifying distant objects was known to Baptists Porta and others but it seems to be equally certain that an instrument for producing these effects was first constructed in Holland, and that it was from that kingdom that Galileo derived the knowledge of its existence. In considering the contending claims, which have been urged with all the ardour and partiality of national feeling, it has been generally overlooked, that a single convex lens, whose focal length exceeds the distance at which we examine minute objects, performs the part of a telescope, when an eye, placed behind it, sees distinctly the inverted image which it forms. A lens, twenty feet in focal length, will in this manner magnify twenty times and it was by the same principle that Sir William Herschel discovered a new satellite of Saturn, by using only the mirror of his forty-feet telescope. The instrument presented to prince Maurice, and which the marquis Spinola found in the Dutch Optician's shop, performing the part of a philosophical toy, by exhibiting a magnified and inverted image of a distant weathercock, must have been a single lens such as we have mentioned, or an astronomical telescope consisting of two convex lenses. Upon either of these suppositions, it differed entirely from that which Galileo constructed; and the Italian philosopher will be justly entitled to the honour of having invented that form of the telescope which still bears his name. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Lives of the Most Eminent Literary and Scientific Men of Italy Spain and Portugal Vol 3 Classic Reprint written by David Brewster and published by Forgotten Books. This book was released on 2018-02-05 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Lives of the Most Eminent Literary and Scientific Men of Italy, Spain and Portugal, Vol. 3 His Embassy to Pope Urban V. 145 He projects a Visit to Venice 145 His Letter to Petrarch, whom he missed seeing 145. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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