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January 4, 1936


JAMA. 1936;106(1):42-43. doi:10.1001/jama.1936.02770010012047

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Manufacturer: McIntosh Electrical Corporation, Chicago.

This unit is recommended for medical and surgical diathermy. It is of the one-tube simple oscillator type. Raw alternating current is fed into the plate of the tubes. The patient circuit is connected inductively to the tank circuit. The input power is about 460 watts. Since there is no acceptable method for measuring the output of short wave machines, this value is not stated. The wavelength is said to be 23.3 meters. According to the firm, this wavelength was selected because it is a free lane, or, in other words, an experimental lane in the broadcasting field, since it has been officially selected by the International Radio Conference for investigative purposes. The transformer temperature rise, after operating at full load for one hour, came within the limit adopted by the Council. The electrodes are made of metal surrounded by protecting felt enclosed in a small

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