Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 439
the dark lines we see,iind not the bright ones : the dark lines of sodium arewidened out over a sun-spot, Fig. 185, showing itspresence in greater quantity, or at greater pressure. Besides the widening of the lines due to pressure,there is soraethino; else which must be mentioned.… … Fig. 186.—Diagram explaining Long and Short Lines. of the slit, the lengths of the lines depend on the lengthof the slit illuminated, so that in this case it appearedthat the slit was not illuminated to an equal extent byall the colours given out by magnesium vapour, but thatthe vapour existed in…
Astronomy · Telescopes
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