The wonders of the heavens, being a popular view of astronomy, including a full illustration of the mechanism of the heavens; embracing the sun, moon, and stars, with descriptions of the planets, comets, fixed stars, double stars, the constellations, the galaxy, or milky-way, the zodiacal light, aurora borealis, or norhtern lights, meteors, clouds, falling stars, aërolites, &c (1837)
Bradford, Duncan. [from old catalog] · Boston, American stationers company · leaf 351
the error byfigure increases inversely as the square of the ra-dius; hence the aberration of the lens will be tothat of the reflector as 4^ x 9 to 4, or as 36 to 1,and the distinctness will be inversely as the areas ofthese circles, which are as the squares of their re-spective diameters; so that… … d d d; the plane speculum c is fixed to a wire, hav-ing its other end attached to a dove-tailed sliding-piece i i, and the face of the plane metal is inclinedto the axis of the tube and the large speculum atan angle of forty-five degrees. In the sliding-piecei i, opposite the small metal, is…
Astronomy
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