The Enthrakometer, an instrument for the measurement of power in rectangular wave guides

The paper describes a new instrument for the measurement of power in rectangular wave guides. The instrument consists essentially of a resistive film, forming one wall of the guide, whose change in resistance, due to the absorption of a small fraction of the power passing through the guide, is used as a measure of that power. The instrument is self calibrating, is extremely broad-banded and can be used for any wavelength for which rectangular guide is employed.