A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 503
tra of the brighter starsare now obtained having,before enlargement, a lengthof fully three inches fromF in the blue of the spec-trum to the extremity ofthe ultra violet. It is apity, of course, that thelower portions of the spec-trum below F cannot bereached in the same way;but no plates… … Fig. 224.Arrangement of the Prisms iu the Slitless Spectroscope K H H 7
Astronomy
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