Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 418
rightof E, and all the parallel rays of each bundle are brought toa focus at a point on the retina. In this way many rays ofeach color are brought to a focus at the same place in theobservers eye. While strictly white light gives.all colors, it is not neces-sary that a luminous body should emit all… … Fig, 139. — A spectroscope having only one prism. infra-red rays. If it is extremely hot, it may radiate mostlyultra-violet rays. 223. The First Law of Spectrum Analysis. — The firsttheoretical discussion of the principles of spectrum analysiswhich reached approximately correct conclusions was…
Astronomy
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