New concepts in diagnosis and treatment : physico-clinical medicine, the practical application of the electronic theory in the interpretation and treatment of disease, with an appendix on new scientific facts . Fig. 7,;^.—Phonograms: D, dulncss and T, tympanitic sound. Phonograms.—Percussion is an empirical procedurewith limitations best realized by the expert with trainedhands and ears. Maladroit percussion yields untrustworthyresults (page 28). Percussion depends on variations in vibrations elicitedby blows on different structures, and the recognition of•clearness, tympany and dulness, is on
New concepts in diagnosis and treatment : physico-clinical medicine, the practical application of the electronic theory in the interpretation and treatment of disease, with an appendix on new scientific facts . Fig. 7,;^.—Phonograms: D, dulncss and T, tympanitic sound. Phonograms.—Percussion is an empirical procedurewith limitations best realized by the expert with trainedhands and ears. Maladroit percussion yields untrustworthyresults (page 28). Percussion depends on variations in vibrations elicitedby blows on different structures, and the recognition of•clearness, tympany and dulness, is only a matter of experi-ence not unlike that of the carpenter, who determines theposition of a stud in the plastered wall by aid of his hammer,or the ganger striking his mallet upon the cask, ascertainsthe level of the wine. To eliminate the personal equation, I have sought tomake tracings of the percussion sounds by fixing a cardio- 84 AUXILIARY METHODS DEMOXSTRATING HUMAX EXERGY graphic attachment in proximity to the site of cardiograph communicates with a sensitive tambour,and the records are made on a revolving Fig. 34.—Sphygmomanometer with a dial 8 inches in diameter and may beread across a room. This large dial magnifies the oscillations of the needle. Therange is 300 mm. The dial is adjustable to any position. Fig. T,;^ represents such a tracing by percussion of thestomach before (tympanitic sound), and during the timeenerg) ^vas conveyed to the stomach region (dulness)*. —It occurred to the author thatthe heart could be utilized for the clinical recognition ofenergy by vagus stimulation. *The author is indebted to Professor J. E. Coover, Department of Psxxhol-ogy, Leland Stanford Junior University, for his valuable aid in making thetracings. SPHYGMOMANOMETRY 00 Physiologists concede that when the ventricle is inhibitedby MODERATE vagus stimulation, the beats although slowerare stronger whereas when stimulation is grea
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