It was a balmy spring night, but the thermometer read well below freezing. The thermometer, in a professor's backyard garden at Raleigh, N.C., was measuring the temperature of the sky. Together with an ordinary thermometer and an anemometer (to measure wind velocity) it was also giving an accurate forecast of local weather for the night.
The device, an invention of Professor Charles M. Heck, head of the physics department at North Carolina's State College, in effect plucks down the sky's low temperature and focuses it on the thermometer. How it works: the polished aluminum...
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