Medicine: Heartbeats

The cardioscope, an instrument which makes it possible to see inside a beating heart, has been perfected by Dr. Duff S. Allen, a young surgical assistant at Washington University, St. Louis, who reported his work at the annual meeting of the American Association of Thoracic Surgeons, Chicago.

The device is in reality a small microscope, about the size of a pocket flashlight, with a strong lens at one end and a powerful light at the other. A small incision is made directly over the heart, and the cardioscope...

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