Recreations in astronomy : with directions for practical experiments and telescopic work (1879)
Warren, Henry White, 1831-1912 · New York : Harper & Brothers · leaf 61
rv-atory is allowed to touch this support. When a star ise found, the earth swiftly rotates the telescope awayfrom it. and it passes out of the field. To avoid this,•k-work is so arranged that the great telescope fol-lows the star by the hour, if required. It will take a;tt it- eastern rising,and… … Fig. 15.—Cambridge Equatorial. weighing six tons, a tube forty feet long, which, withits appurtenances, weighs seven tons more. It movesbetween two walls only 10° east and west. The newParis reflector (Fig. 16) has a much wider range ofmovement. The Spectroscope. A spectrum is a collection of the…
Astronomy
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