Our purpose in this report is to record the use of a new device for photographing heart sounds. The electrostethograph,1 designed by M. L. Lockhart, appears to have certain advantages over other types of apparatus used for this purpose. A brief presentation of the historical background in the development of this field of investigation may be of interest.
According to Hirschfelder,2 the first method for recording heart sounds was introduced by Donders in 1856 and was revised by Martius in 1888. It consisted of beating the time of the sounds on a receiving tambour and recording the movements of the lever.
Hürthle in 1893, Einthoven and Geluk in 1894 and Holowinski in 1896 were the first to employ methods in which the sounds were received by means of a microphone.3 Hürthle received the sounds by a stethoscope connected with a resonance apparatus, which magnified the amplitude of
BIERRING WL, BONE HC, LOCKHART ML. USE OF THE ELECTROSTETHOGRAPH FOR RECORDING HEART SOUNDSPRELIMINARY REPORT. JAMA. 1935;104(8):628–631. doi:10.1001/jama.1935.02760080024006
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