Medicine: New Medical Wrinkles

Doctors have long sought a way to handle night calls. Latest system, launched in London: a firm that takes doctors' calls, like a telephone answering service, immediately dispatches substitute physicians in prowl cars with two-way radios. Doctors can subscribe to the service for a night (cost: $1.05), a week (cost: $7.56) or a weekend (cost: $4.20).

Other new wrinkles:

¶A dental X-ray machine that takes a single panoramic picture of the whole mouth in 40 seconds.

¶A cheap, simple meter to measure blood flow directly. It was made by Dr. Henry H. Swain of the University of Michigan from the pinion gear of...

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