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 546
i : : 7 : 83 for Jupiter. 365i : 10759J : : 5 : 148 for Saturn. 365| : 30686 : : 3 : 253 for Uranus. On account of the number of teeth required ON ORRERIES. 521 for the wheel which moves Uranus, it is frequentlyomitted in Planetariums, or the planet is placedupon the arbor which supports Saturn. If… … AM (fig. 93.) of 83 teeth, BL of 52, CK of 50,for the earth, DI of 40, EH of 7, and FG of 5 ;and another set of wheels moving freely about anarbor having the number of teeth in the fourthcolumn, namely AN of 20, BO of 32, CP of 50—for the earth ; DQ of 75, ER of 83, and FS of148. Then, if these two…
Astronomy · Astronomical instruments · Telescopes
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