Mid-to-high-Zprecision x-ray measurements

New x-ray wavelength (energy) and width measurements are reported for a number of elements from $47\le Z\le 92$. The x rays were produced with the use of an electron Van de Graaff, and the measurements were made with a two-axis flat-crystal transmission spectrometer equipped with angle-measuring interferometers. The new measurements reported here, combined with other high-precision x-ray wavelengths, form a moderately extensive data base for comparison with theoretical calculations. Comparison with recent revisions of a previously available all-$Z$ calculation reveals improved patterns of general agreement with, however, important exceptions. The newly measured linewidths are in agreement with widths calculated via relativistic wave functions used for the term estimates.