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 111
86 THE PRACTICAL ASTRONOMER. maft will see his foot at D, and consequently hiswhole figure at BD. figure 17. … A person when looking into a mirror, will alwayssee his own image as far beyond the mirror as lieis before it, and as he moves to or from it, theimage will, at the same time, move towards or fromhim on the other side ; but apparently with a dou-ble velocity, because the two motions are equaland…
Astronomy · Astronomical instruments · Telescopes
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