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 585
, the telescope has 560 APPENDIX. no equatorial motion, but it very shortly will;and at no very distant day, clock-work will beconnected with it, when the observer will, whileobserving, be almost as comfortable, as if he werereading at a desk by his fire-side. The following figure shews a section… … joint, which allows the tube to turn in all direc-tions ; C the speculum in its tube ; D the box ; Ethe eye-piece; F the moveable pulley; G thefixed one; H the chain from the side of the tube ;I the chain from the beam ; K the counterpoise ;L the lever ; M the chain connecting it with thetube ; Z…
Astronomy · Astronomical instruments · Telescopes
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