Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 398
darkband in the yellow now appears. It is not really black, but compara-tively dark. Next hold the plate T between the burner and the condensers so thatthe calcium light may be cut off from the upper portion of the slit,leaving the light from the sodium flame alone to pass through this partof the… … Fig. 287. other half. A, shows a dark line on the continuous spectrum. We thushave, contiguous to each other, the bright line spectrum of sodium andits reversed, dark line, or absorption spectrum. If you use salts of lithium,potassium, strontium, etc., in a similar manner, you will find in…
Physics
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