The geography of the heavens, and class-book of astronomy: accompanied by a celestial atlas (1873)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, ed, Whitall, Henry, 1819-1887? Celestial planisphere · New York, Sheldon & company · leaf 318
f theydiverged from the cen-ter of a circle formedby the convex surfaceproduced. In this cut, the parallel raysA are dispersed by the double-concave lens C, as shown atB; and their direction, asthus refracted, is the same as if they proceeded from the point D, which is the center of a circle formed… … The ordinary burning-glass, which may bebought for a few shillings, is a double-convexdisk of glass two or three inches in diameter,nclosed in a slight metallic frame, with a han-dle on one side. Old tobacco-smokers some-times carry them in their pockets, to light theirpipes with when the Sun…
Constellations · Stars
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