Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 118
e source from which the light proceeds. If a beamof sunlight be allowed to fall on a prism, it is splitup into a coloured band in which the colours arearranged in the order violet, indigo, blue, green,yellow, orange, red. Each gradation of colour cor-responds to a particular length of wave and time… … THE SUN 107 to pass through a very narrow slit A in the focalplane of an object glass B (Diagram LIII). The lightfalls on B andemerges as aparallel pencil ofrays. This fallson the prism C, ^<whose edge isparallel to the slit A. All the rays of any one wave-length emergein parallel directions…
Astronomy
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