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The production and extraction of artificiall~gHg from l~~Au bombarded by neutrons is described, and the procedure in making electrodeless lamps with l~gHg is given in detail. These lamps are excited by high-frequency radio waves; they emit the mercury spectrum entirely free from isotope shifts and hyperfine structures that characterize natural mercury. Fabry-Perot interferometers and a prism spectrograph were employed for measuring, relative to Cd 6438.4696 angstroms, the wavelengths of the stronger lines in the visible spectrum of l~gHg. Preliminary values for l~gHg radiations in normal air are reported as 5790.
Meggers et al. (Mon,) studied this question.
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