Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 149
ical parts made of some materialmore transparent to these rays than glass. Quartz is by farthe best substance, for calcite is not transparent to the extremeultra-violet, and, moreover, the double refraction exhibited byit is a great drawback. In a prism spectrograph, therefore,intended for use in… … the quartz-fluorite achromatic combination would be of great 134 SPECTROSCOPY , service. On the other hand, the quartz calcite combinationsuffers from the want of transparency to the extreme jiltra-violet already mentioned. Generally speaking, if quartz lensesbe used alone it will be found that the…
Spectrum analysis
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