Lectures on some recent advances in physical science with a special lecture on force (1876)
Tait, Peter Guthrie, 1831-1901 · London, Macmillan and co. · leaf 217
le time after-wards by the great optician Fraunhofer, whence theyhave been called Fraunhofers lines. Of those lines one of the most remarkable is that towhich Fraunhofer gave the name of D, which you willsee upon the picture near the boundary between orangeand yellow. When, however, a very perfect… … characteristic,—two almostequally strong dark linesacross the spectrum, so closetogether as to be quite in-capable of being separatedfrom each other without theuse of a telescope, or of agreat number of prisms in-stead of one. Now, Fraunhofer observedthat in the flame of an or-dinary tallow candle,…
Force and energy · Matter · Heat · Spectrum analysis
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