The Astrophysical journal . NOVA 2i3ig. April 29, 1898. Ex. ic H 21 2; I B 21258. April 19, 1898 April 21, ll .SlECrRA OF NOVA at the Harvard College Observatory, Arequipa, Peru. THE ASTROPHYSICAL JOURNAL AN INTERNATIONAL REVIEW OF SPECTROSCOPYAND ASTRONOMICAL PHYSICS VOLUME IX APRIL 1899 NUMBER 4 ON A GRAPHIC METHOD OF COMPARING THP:RELATIVE EFFICIENCIES OF DIFFERENT SPECTROSCOPES. By H. C. Lor d. Anyone who has occasion to use a spectroscope of compara-tively small resolving power, in order to obtain photographicspectra, at once finds that, with rapid coa
The Astrophysical journal . NOVA 2i3ig. April 29, 1898. Ex. ic H 21 2; I B 21258. April 19, 1898 April 21, ll .SlECrRA OF NOVA at the Harvard College Observatory, Arequipa, Peru. THE ASTROPHYSICAL JOURNAL AN INTERNATIONAL REVIEW OF SPECTROSCOPYAND ASTRONOMICAL PHYSICS VOLUME IX APRIL 1899 NUMBER 4 ON A GRAPHIC METHOD OF COMPARING THP:RELATIVE EFFICIENCIES OF DIFFERENT SPECTROSCOPES. By H. C. Lor d. Anyone who has occasion to use a spectroscope of compara-tively small resolving power, in order to obtain photographicspectra, at once finds that, with rapid coarse-grained plates, it isabsolutely impossible to photograph nearly as many lines in thesolar spectrum as can be observed visually, and that with fine-grained lantern slide plates much better results can be difficulty is evidently due to the coarse granular structureof the rapid plate. Thus far the makers of photographic plateshave been unable to secure sensitiveness and at the same time fine-ness of grain. It would seem proper therefore that in the con-struction of a spectros
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspectru, bookyear1895
