¶ Not content with an FM transmitter so small that it can be swallowed for broadcasting from inside the digestive tract (TIME, April 22), medical research-TS and electronics designers have produced a microphone so small that it can be put in the end of a catheter (flexible tube) and worked through a blood vessel right into the heart. Developed by New Jersey's Gulton Industries, Inc., the microphone is one-twentieth of an inch in diameter, three-quarters of an inch long. Dr. Howard L. Moscovitz of Manhattan's Mt. Sinai Hospital has used it to diagnose heart defects-by placing it next to heart valves...
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