On The Relation between the K Series and the L Series of X-Rays

Synopsis.—The object has been to measure both the emission and the absorption wave-lengths in the K and L-series characteristic of a chemical element (tungsten), using the same X-ray spectrometer throughout, to see if general relations among them could be found. Graphs have been drawn representing the ionization currents as functions of the crystal table angle. The peaks in these graphs corresponding to the lines ${\alpha }_1$ (strong) and ${\alpha }_2$ (medium) appear completely separated from each other, although the difference between their wave-lengths amounts to only 2.2 per cent. There is also faint evidence of a third (very weak) line, ${\alpha }_3$.