The practical astronomer : comprising illustrations of light and colours, practical descriptions of all kinds of telescopes, the use of the equatorial-transit, circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy (1845)
Dick, Thomas, 1774-1857 · London : Seeley, Burnside, and Seeley · leaf 240
eflecting telescopes. In this chapterI shall describe the various kinds of refractingtelescopes. SECT 1. THE GALILEAN TELESCOPE. This telescope is named after the celebratedGalileo, who first constructed, and probablyinvented it in the year 1609. It consists of onlytwo glasses, a convex glass next… … represent the convex object-glass, presented toany object in the direction DEI, so that the raysfall parallel upon it;—if these rays, after passingthrough it, were not intercepted by the concavelens K, they would pass on, and cross each otherin the focus F, where an inverted image of theobject…
Astronomy · Astronomical instruments · Telescopes
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