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January 4, 1936


JAMA. 1936;106(1):43. doi:10.1001/jama.1936.02770010013048

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Manufacturer: E. J. Rose Manufacturing Company, Los Angeles.

This unit is recommended by the manufacturer for medical diathermy and for electrosurgery. It is a conventional two-tube oscillator, push-pull type of circuit, modified for physical therapeutic purposes. The patient's circuit is capacitatively coupled to the oscillator. The milliammeter, like that on other short wave machines, does not indicate the actual current through the patient but serves to indicate relative power and also to determine whether the unit is in resonance.

The wavelength is about 16.4 meters and the input power about 540 watts. Since there is no acceptable method for measuring the output power of diathermy machines, this value is not stated. The shipping weight of the standard unit is about 80 pounds. Figure 2 is a schematic diagram of the circuit.

Tissue heating ability of the machine was investigated in a clinic acceptable to the Council. Cuff electrodes, about 5

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