The origin of thermal ionisation from carbon

Abstract

In the ‘Proceedings’* Dr. J. N. Pring describes interesting experiments designed to throw light on the origin of thermal ionisation from carbon. These experiments form a continuation of earlier experiments along similar lines by J. N. Pring and A. Parker. In commenting on the earlier work, Dr. Pring says:- - “It has been shown bby the present writer, in conjunction with A. Parker, that the ionisation which is produced by carbon at high temperatures abd in presence of gases at low pressures, is reduced to a much smaller order of magnitude by eliminating impurities from the carbon, and by exhausting to a high degree the containing vessel.