Abstract
THE experiments of Kirchner (Ann. d. Phy., 4, 77; 1925) and of Gill and Donaldson (Phil. Mag., 2, 129) have shown that a tube, pumped down to what is usually termed a non-conducting vacuum, will give a brilliant discharge if excited at comparatively low voltage at a frequency corresponding to a six- or seven-metre wave, the current being fed to the tube through external electrodes of tin-foil. During the past summer we have made a further study of the phenomena exhibited by these high-vacuum tubes, with especial reference to thespectra of the discharge.
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