A System of Mechanical Philosophy
Cambridge Scholars Publishing, 2009 - 130 pages
Book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1822. Excerpt: ... 403 TELESCOPE. Telescope, an optical instrument for viewing distant objects; so named by compounding the Greek words nxi Jar off, and rxtru, to look at or contemplate. This name is commonly appropriated to the larger sizes of the instrument, while the smaller are called Perspective Glasses, Spy-glasses, Opeea-glasses. A particular kind, which is thought to be much brighter than the rest, is called a Night-glass. To what has commonly been stated, respecting the inventor of this most noble and useful instrument, we may add the two following claims. Mr Leonard Digges, a gentleman of the last century, of great and various knowledge, positively asserts in his Stratoticos, and in another work, that his father, a military gentleman, had an instrument which he used in the field, by which he could bring distant objects near, and could know a man at the distance of three miles. He says, that when his father was at home he had often looked through it, and could distinguish the waving of the trees on the opposite side of the Severn. Mr Digges resided in the neighbourhood of Bristol. Francis Fontana, in his Celestial Observations, published at Naples in 1646, says, that he was assured by a Mr Hardy, advocate of the parliament of Paris, a person of great learning and undoubted integrity, that on the death of his father, there was found among his things an old tube, by which distant objects were distinctly seen; and that it was of a date long prior to the telescope lately invented, and had been kept by him as a secret. It is not at all improbable, that curious people handling spectacle-glasses, of which there were by this time great varieties, both convex and concave, and amusing themselves with their magnifying power and the singular effects which they produced in the appearances of things, might...
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