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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 110

An illustration from 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, leaf 110
ole of hisown image in the glass ab, which is but one halfas large as himself. The rays from the head passto the mirror in the line Aa, perpendicular to themirror, and are returned to the eye in the sameline; consequently, having travelled twice thelength Aa, the man must see his head at B. Fromhis… … 86 THE PRACTICAL ASTRONOMER. maft will see his foot at D, and consequently hiswhole figure at BD. figure 17.

Astronomy · Astronomical instruments · Telescopes

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