Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 344
that has taken place (Fig. 83). Insteadof the white light you have now all the colours of therainbow—red, orange, yellow, green, blue, indigo, violet, Stars. 329 marked by their initial letters in the figure. These coloursare very beautiful, but they are transient, for the momentwe take away the… … Fig. 83.—How to split up a Ray of Light. consequently the blue is carried away much further thanthe red. Such is the way in which we study the composi-tion of a heavenly body. We take a beam of its light, wepass it through a prism, and immediately it is separatedinto its components; then Ave…
Astronomy
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