Thermionic Emission from Carbon and the Carbon Arc

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See (1) for these references.

Druyvesteyn M. J. and Penning F. M. , Rev. Mod. Phys., 12; 140 (1940).

Cobine J. D. , “Gaseous Conductors”, p. 300 (McGraw-Hill, 1941).

Loeb L. B. , “Fundamental Processes of Electrical Discharge in Gases”, pp. 613 and 629 (John Wiley, 1939).

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Mackeown S. S. , Phys. Rev., 36; 611 (1929).

Froome K. D. , Proc. Phys. Soc., London, 60; 424 (1948).

Somerville J. M. and Blevin W. R. , Phys. Rev., 76; 982 (1949).

Reference (4), pp. 305 and 355.