Astronomy for schools; upon the basis of Mons. Arago's lectures at the Royal observatory of Paris .. (1841)
Arago, F. (François), 1786-1853, Haskins, Roswell William, [from old catalog] ed · New York, Robinson, Pratt & co.; · leaf 35
of a polished,metallick mirror, in the focus of which the image is 32 OP ASTRONOMICAL INSTRUMENTS. formed, by reflection. Of this instrument there areseveral forms, differing widely from each other, inmany particulars of their construction, and generallydistinguished, among astronomers, by the… … In this figure A B is a concave, metallick mirror,with a hole through its centre. In front of this mir-ror, is placed a small, concave one, C D, which ismoveable by the screw W. An eye piece, consistingof two convex lenses, E, F, is placed immediately be-hind the great mirror. The incident rays M…
Astronomy
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