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 23
hearrow, will be showna: D: the poin:. S .in like manner at D ;and the intermediateportions of the arrowwill be seen, in therightline,DD. Thusthe entire ima gthe arrow will be com-prised between D O,DO: its actual size,D D . will be equal toS S; in other words,to that of the objectitself: but it… … A OP ASTRONOMICAL INSTRUMENTS. 21 As to curved surfaces, whatever may otherwise betheir figure, for determining, in general, the apparentplace, the form and the magnitude of the images whichthey reflect, it will suffice to conceive the reflectionof each luminous ray to be made upon the plane…
Astronomy
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