Abstract
The amplification constant of three electrode vacuum tubes is mathematically derived in terms of readily measurable physical dimensions of the tube. Curves are plotted enabling the rapid pre-determination of tube amplification constant on this basis. The curves are shown to give results agreeing with experiment for a number of types of tubes. The internal resistance of the tube is similarly deduced, and an agreement between theory and experiment shown. Certain deviations in specific instances are explained.

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