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 134
unacquaintedwith the country—of this fact, that he was quiteindignant at an Arab who attempted to explain tohim that it was a mere optical delusion. Atlength they reached Rosetta in about two hours,without meeting with any water; and on lookingback on the sand they had just crossed, it seemedto… … was seen above the horizon. An inverted imageof it was seen at b, immediately above the realship a, and an erect image at c, both of them 110 THE PRACTICAL ASTRONOMER, being complete and well defined. The sea was dis-tinctly seen between them, as at v w. As the shiprose to the horizon the image c…
Astronomy · Astronomical instruments · Telescopes
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