Abstract
That most of the transformers and current controllers designed for use with electrosurgical instruments have some unsatisfactory features is a fact well known to every one who has occasion to use them. Most of these appliances, constructed on the resistance principle, are subject to fluctuations in the main power line, which are proportionately reflected in the instrument circuit and often result in the burning out of a lamp. On a wet operating room floor they may "ground," to the extreme discomfort of the patient and the annoyance of the surgeon. Although I designed the apparatus described here for use primarily with urologic instruments, it serves equally well for any of the small diagnostic lamps. It is made up from ordinary dry batteries and stock radio parts that can be purchased anywhere. After the rheostat has been mounted on the panel, the latter is fastened to the dry cells with strips
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