Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 214
before it isallowed to enter theechelon apparatus, onaccount of the very smallangle between two suc-cessive orders of spectra.For this purpose the mostconvenient form of aux-iliary spectroscope is theconstant deviation in-strument describedp. 122. With thisparatus the eyepiece isremoved, and the… … onap- THE DIFFRACTION GRATING 197 slit, without any further adjustment. The echelon spectroscopeis similar to any ordinary spectrometer, in that it possesses acollimator and telescope; it is, as will readily be seen fromwhat has gone before, essentially a direct-vision instrument;it should be…
Spectrum analysis
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