Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 477
ordinary Telescope consists of an object-glass andan eye-lens, with two intermediates to bring the objectinto an erect position. A lens brings it near to us, anda magnifier enlarges it for inspection. We will now givea short history of the Telescope and its, improved con-struction. Roger Bacon was… … Converging rays to a focus. Porta found out the power of the convex lens to bringobjects nearer. It was, however, according to the oldtale, quite by an accident that the Telescope was discoveredabout the year 1608. In Middleburg, in Holland, lived a spectacle-makernamed Zachary Jansen, and his…
Scientific recreations
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-273-178.webp)
