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 31
object A B will there be exhibited. We have seen, above, that a ray of solar light, re-fracted, is decomposed in rays of different colours.Such decomposition, therefore, colours the images ofobjects and renders them confused. This evil is soserious a one that Sir Isaac Newton long sought toremedy… … OF ASTRONOMICAL INSTRUMENTS. 29 discovered of remedying this difficulty. The remedyconsists in employing lenses of substances which,while they disperse light equally, refract it unequally.The crown glass and flint glass of opticians, are suchsubstances; and it is by combining, in proper…
Astronomy
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