. On the Constitution of the Electric Spark . c 3793 r 54614359 3663 43593663 aft 7 P 7 V (metres persecond). 18901 415 545 V (metres persecond). 13001 406 524. Magnesium.—In photographs taken on a stationary film we note the completeabsence of the triple line in the green, which forms a prominent feature of themagnesium spectrum under ordinary conditions. The whole energy of the spectrumseems to be concentrated into the line at 4481 (a), which is exceptionally strong, andinto the triplet beginning with 3838*4 (ft), which appears as a doublet in our films, thetwo last lines probably not being
. On the Constitution of the Electric Spark . c 3793 r 54614359 3663 43593663 aft 7 P 7 V (metres persecond). 18901 415 545 V (metres persecond). 13001 406 524. Magnesium.—In photographs taken on a stationary film we note the completeabsence of the triple line in the green, which forms a prominent feature of themagnesium spectrum under ordinary conditions. The whole energy of the spectrumseems to be concentrated into the line at 4481 (a), which is exceptionally strong, andinto the triplet beginning with 3838*4 (ft), which appears as a doublet in our films, thetwo last lines probably not being resolved. A strong line seen both in arc and 206 MESSES. A. SCHUSTER AND G. HEMSALECH ON ordinary sparks at 4703 is also absent. When the spectrum is photographed on therotating film, the lines resolve into remarkable clouds (fig, 20, Plate 10), which do notadmit of measurement. The appearance of the lines shows, however, that the velocitiesof the magnesium particles is great, and approximately the same as that of aluminium. Aluminium.—The prominent lines are the two triplets beginning with 4512 (a)and 3613 (/3) respectively, and the doublet which li
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