Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 304
of thesame tube. Parallel rays pass fromthis tube to theprism and are thererefracted so as topass into the observing telescopeon the right. Thisis movable so as to take successive parts of the spectruminto the field of view. When the solar spectrum is examined by such a spectroscope it is found to… … Fig. 146. 294 LIGHT. refracting edge parallel to the slit. The rays reachingthe prism were then nearly parallel. Fraunhofer studiedthem in 1814-15, counted about 600 of them, and markedthe places of 354 on a map of the spectrum. They aretherefore often called Fraunhofers lines. The solarspectrum is…
Physics
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