Multiple Electrical Stethoscope and Electrical Filters as AIds to Diagnosis

The electrical amplifier stethoscope furnishes in the auscultatory portion of physical diagnosis an instrument that may make possible advances comparable with those which resulted from the introduction of the microscope in the field of anatomy. By its magnification of sound, it makes available murmurs and lung sounds hitherto inaccessible. By the use of electrical filters which may be connected with it, it enables the clinician to analyze chest sounds in a way heretofore impossible, and to magnify to a still greater degree those which he suspects of being of importance. The instrument, which has been previously described, 1 has been still further improved by its designers, the Western Electric Company. The amplifier has been greatly increased in efficiency so that it can now supply a thousand or more receivers with sounds of the intensity heard with the usual stethoscope. It has been assembled in a single unit mounted on wheels