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Modern medicine is in search of precision instruments capable not only of rendering dependable service in the routine examination but also of opening new avenues of approach to unexplored regions of physiology and pathology. The importance of the analysis of heart sounds in the diagnosis of various cardiopathies induced Einthoven, Weiss, Wiggers and many others to construct ingenious sound recording apparatus, which however remained confined to a few laboratories on account of their imperfections, cost, bulk and fragility. Only in recent years, especially since the advent of radio, has the progress in this field been great, and heart sound recording devices can now be used not only for the study of the genesis and mechanism of normal sounds but also for the diagnosis of murmurs and pathologic rhythms. After a brief description of the apparatus the author devotes some space to a discussion of the graphic characteristics of normal and
Atlas de phonocardiographie clinique. JAMA. 1939;112(20):2088. doi:10.1001/jama.1939.02800200086031
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