Memoir of Henry Draper 1837 1882

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The great superiority of the photograph over a drawing, even in the visible regions of the spectrum, is shown by comparing 18 HENRY DRAPER the portion of the more refrangible region taken from Angstrom's chart and printed on the plate with the photograph beneath it.
Between wavelengths 3, 925 and 4, 205 the drawing shows only 1 is lines, while the original negative shows 293 at least.
In order to fit a scale to the photograph, advantage was taken of the fact that the second spectrum overlaps th
...e third, the ray I) of the second heing near H of the third and b of the sen, ml near

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