Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 216
he D lines arebrought upon the echelon slit; on looking through the echelontelescope with the eyepiece removed, the object glass shouldappear equally illuminated all over, with, perhaps, two slightand symmetrical black strips to the right and left; if this isthe case the instrument is in… … THE DIFFRACTION GRATING 199 telescope. For example, if the line be seen under the con-dition ^ = o, then it will appear as a single very bright line inthe middle of the field, with a series of very faint lines diminish-ing in intensity on each side of it. The two neighbouring orders on each side…
Spectrum analysis
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