Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 438
ses that there arevery great changes in them. If, for instance, we examinethe bluish-green line given by hydrogen, we shall find itincrease in width as the pressure increases. This kindof effect can be shown on the screen by means of theelectric lamp. We place some sodium on the carbonpoles in the… … Fig. 185.— Spectrum of Sun-Spot. greater is the quantity of the sodium vapour thrown out,and associated with the greater quantity of vapour is adistinct variation of the light—in fact, an increase in thewidth and brightness of the yellow lines on the screen. Now just to give an illustration of the…
Astronomy · Telescopes
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