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July 1939


Arch Derm Syphilol. 1939;40(1):53-58. doi:10.1001/archderm.1939.01490010056007

During the past several years there has been an increasing use of small unrectified x-ray machines by dermatologists. This type of equipment has been used over a period sufficiently long to permit evaluation, and we feel that a critique would be of value to dermatologists contemplating purchasing new machines in the near future.

The several types of x-ray apparatus available for treatment may be classified in the following groups: full wave rectified, either mechanically or by means of four valve tubes; half wave suppressed by means of one or two valves, and half wave suppressed (so-called unrectified) by means of the x-ray tube itself. An understanding of what rectification is and why it is employed is necessary to an intelligent understanding of the problem. There is still a rather widespread impression among both radiologists and dermatologists that a machine with an unrectified circuit is unsuitable for treatment. This impression is

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