THE investigations of McNair (Phys. Review, 31, 986; 1928) have shown the complicated behaviour of the Zeeman patterns of the mercury resonance line, 2537 A., in emission. Some observations made in ...

RECENTLY Schüler and Keyston 1 have made some interesting studies on the hyperfine structure of the spectral lines of thallium, from which they conclude that the hyperfine structure is due in part to ...