September 13, 1938. "What next? Unborn baby's heartbeat broadcast from Washington hospital. As part of an educational program, the heartbeats of an unborn baby were broadcast today from Georgetown University Hospital. This was made possible by the use of a specially designed microphone placed on the chest of the expectant mother, Addie Gonyea, shown with (left to right) Dr. J.G. Burd, Dr. John Cavanagh, announcer Bill Coyle of the N.B.C. and Dr. Henry B. Gwynn." Harris & Ewing Collection glass negative.
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