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 22
thout sensible extent, the ray determined by the preceding rule, is the only one which can be rejected tothe eye. But the opening ofthe pupil, which ad-<i mits rays into the eye,is not a mathematicalpoint; it is a spacewhich, in man, hasabout ,07874 of aninch diameter, andwhich we may repre-sent… … 20 OP ASTRONOMICAL INSTRUMENTS. evident that these would form a cone with a circularbase, of which the apex would be D, and the baseL L. To the eye penetrated by reflected rays theluminous body appears placed at the point from whichthe visible rays seem to diverge. Thus, the eye beingplaced at 0,…
Astronomy
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