When a man is healthy, the sound of his heartbeat is a solid, relatively high-pitched bong; when he is ill, it is a dullish, soggy boom. The highest heart sound is somewhere at the bottom of the range of a bass viol; the lowest is inaudible to human ears, even with a stethoscope. A delicate device to record these sounds on photographic film has been developed at Du Font's Haskell Laboratories by Dr. John Henry Foulger and Physicist Paul E. Smith Jr. The device consists of a microphone strapped to the chest, and a...
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