. American X-ray journal . much ampli-fied al the free end. Tins was illustratedby a coil kindly loaned for the purposeby Mr. Scheidel. An arm at the upper obtained thru the electrodes are of muchlower potential than those from eitherthe hyperstatic or the Oudin resonator,but in spite of this the current is consid-erable when the resistance of the elec-trode-circuit is small. This was also il-lustrated by a coil from Dr. Pratts labor-atory. Dr. H. P. Pratt then gave a very fullexplanation of the physiologic and thera-peutic action of high frequency currents,showing wherein they were similar to
. American X-ray journal . much ampli-fied al the free end. Tins was illustratedby a coil kindly loaned for the purposeby Mr. Scheidel. An arm at the upper obtained thru the electrodes are of muchlower potential than those from eitherthe hyperstatic or the Oudin resonator,but in spite of this the current is consid-erable when the resistance of the elec-trode-circuit is small. This was also il-lustrated by a coil from Dr. Pratts labor-atory. Dr. H. P. Pratt then gave a very fullexplanation of the physiologic and thera-peutic action of high frequency currents,showing wherein they were similar to thealternating and more particularly to thesinusoidal current. Metabolic changesin the tissues are hastened and oxidation CHICAGO ELECTRO-MEDICAL SOCIETY. 320 and elimination are both these currents have beenfound very advantageous in most forms oftuberculosis, in skin lesions, and in dis-turbances of the nervous system. Several other members of the societytook part in the discussion. Dr. Byron. OUDIN RESONATOR. Robinson then read a paper of which thefollowing is an abstract: Diagnosis of Ureteral x-ray lias made a new era in thediagnosis of ureteral calculi. Previousto the x-ray there was no pathognomonic symptom. The old classic symptoms ofpain or ureteral colic hematuria and theexpulsion of a calculus is a medical final court of diagnosis of a ureteralcalculus is an x-ray. At first the x-raywas uncertain in this diagnosis, but withthe improvement of the method it isnow a last resort. The x-ray is the sov-ereign method to detect a ureteral cal-culus. There are at present two classes of phy-
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