Abstract
The ground term combinations of J = 1 levels belonging to the 2p5ns and nd configurations of Mg III have been accurately measured with a 5-metre grazing incidence vacuum spectrograph. 24 lines have been observed in the range 234-157 Å. The 2p5nl level system, of good internal accuracy, has been located in relation to the ground term from the results. From these levels a set of wavelengths in the 234-169 Å range have been calculated, which should be internally consistent to 0.0003 Å and have an absolute accuracy of about 0.002 Å.

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