The full widths at half maximum of the $K{\alpha }_1$ and $K{\alpha }_2$ lines of 14 elements from 26Fe to 47Ag have been investigated with the double spectrometer in the (1, 1) position. The calcite crystals used had been previously studied in the (1, -1) position and shown to give results agreeing well with those to be expected from a perfect calcite crystal. The reported widths are uncorrected for the effects of overlapping of the lines, vertical divergence of the x-ray beam, or diffraction pattern widths of the crystals. They are, in X—units The $K{\alpha }_1$ lines of Fe, Co, Ni, Cu, Zn and Ge are definitely asymmetrical, the center lying to the long wave-length side of the maximum ordinate. Pronounced difference in width of $K{\alpha }_1$ and $K{\alpha }_2$ and asymmetrical lines are found in and near the region of the periodic table where the ${\mathrm{M}}_{\mathrm{iv}}$${\mathrm{M}}_{\mathrm{v}}$ shells are filling with electrons.

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