. Carnegie Institution of Washington publication. purpose. White light from a collimator, L, is doubly refracted by this prismC, and the extraordinary ray a, just missing the grating G (above or on thesides), impinges on the opaque mirror M and is thence reflected to the gratingG. The ordinary ray a is reflected from the opaque mirror N and thence alsoreaches the grating. These two pencils, b, b, are directly reflected by thegrating (DXio6 = 2oo cm.) into Rm and Rn and diffracted into Droand suitably adjusting the grating between C and M and inclining it as shown,two coincident spectra m
. Carnegie Institution of Washington publication. purpose. White light from a collimator, L, is doubly refracted by this prismC, and the extraordinary ray a, just missing the grating G (above or on thesides), impinges on the opaque mirror M and is thence reflected to the gratingG. The ordinary ray a is reflected from the opaque mirror N and thence alsoreaches the grating. These two pencils, b, b, are directly reflected by thegrating (DXio6 = 2oo cm.) into Rm and Rn and diffracted into Droand suitably adjusting the grating between C and M and inclining it as shown,two coincident spectra may be made to pass along the common direction cto the telescope at T. These spectra are quite intense. One is somewhat REVERSED AND NON-REVERSED SPECTRA. 61 more dispersed than the other, owing to the difference of angles of incidencei, i and to the residual or differential dispersion at the calc-spar prism, foronly the a pencil has been adequately achromatized. In my apparatus thedistances CM and GM were about 130 and 100 cm. and the distance N
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Keywords: ., bookcentury1900, bookdecade1910, bookidcarnegieinst, bookyear1917
