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 547
-2 round, representing theproportional motion of Jupiter; and the wheelEG will turn the wheel FS, about round,and represent the motion of Saturn, and so of allthe rest. The following figure (fig. 94.) represents the figure 94. … ON ORRERIES. 523 appearance of the instrument when completed.Upon the upper part of the circular box is pasteda Zodiac circle divided into 12 signs, and eachsign into 30 degrees, with the corresponding daysof the month. The wheel-work is understood tobe within the box, which may either be…
Astronomy · Astronomical instruments · Telescopes
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