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The line intensities reported in the NBS Tables of Spectral-Line Intensities [1] * were observed in a 10amp arc in air between copper electrodes containing one atom of an added element for every 1,000 atoms of copper. In order to reduce the original observations to a true scale of relative intensities, numerous lines in the first spectrum of copper were selected to serve as reference standards of intensity. The relative power radiated by these lines was measured by comparing the copper spectrum with the spectra from an incandescent ribbon-filament lamp operated at a known temperature and from a calibrated hydrogen-lamp continuum. The measurements were made by the standard methods of heterochromatic photographic photometry and are described in detail in the NBS Tables [1] and elsewhere by Meggers, Corliss, and Scribner [2]. From 2 to 24 determinations were made on each of 207 lines of Cui between 2600 and 8100 A, with an average of about 9 determinations per line. A section of a typical plate is shown in figure 1. pi,The spectrum of copper consists of sharp lines and diffuse lines. In this investigation the spectrograph slit was adjusted to a sufficient width to form flattopped images of the sharp lines. Intensities measured in the plateau of these images are propor-

Spectral-line intensities and gf-values in the first spectrum of copper