A working manual of high frequency currents / by Noble M. Eberhart.

  • Eberhart, Noble M. (Noble Murray), 1870-
Date:
[1911]
Catalogue details

Licence: Public Domain Mark

Credit: A working manual of high frequency currents / by Noble M. Eberhart. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    I employ a current of sufficient strength to produce a spark one-half 1o three-quarters of an inch in length. The discharge from the smaller Tesla coils is relatively sharper than from the resonator or larger Tesla outfits, and a shorter spaj'k is used as the patient cannot tolerate quite as much cur- rent in these instances. With a tube capable of delivering a spark of the length given, I do not try to make use of the full length spark, but keep the tube in light contact with the skin, thus giving a sufficient intensity of current but avoiding the pain that would result if the tube were held at full spark- ing distance from the surface. The tube is passed rapidly back and forth over the area treated, and this will be accomplished in the easiest manner by .holding the tube lightly with the fingers with the thumb extended along the handle. A side to side motion with the wrist will soon become a matter of habit to the operator and the tube will pass lightly over the surface without any sudden jerks •or elevations to cause annoying sparks. If the skin is moist and the tube sticks, it may be dusted with talcum or other dusting powder to