A set of tables containing spectral intensities for 39000 lines of 70 elements, as observed in a copper matrix in a d-c arc, was completed and published. Studies of the intensity data indicate that they may be converted to approximate transition probabilities. These data are not of the precision obtainable by the methods previously mentioned, but the vast number of approximate values available will be useful in many areas.

Research continues on the very complex spectra of the rare earth elements. New computer and automation techniques were applied to these spectra with considerable success.