Word: infra
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...look directly at the eclipse." What makes an eclipse so dangerous is that it works insidiously. As the twilight deepens, the viewer can look at the sun without squinting. Meanwhile, the pupils of his eyes are opening wider -just in time to receive the shattering bombardment of infra-red rays that continue after most of the visible radiation is gone. There is no warning pain as the radiation passes through the viewer's dilated pupil and is focused onto the center of the retina, even when the concentrated rays burn a hole in this sensitive, irreplaceable screen. Slight damage...
...picture is snapped. But Dr. Gershon-Cohen, a radiologist at Albert Einstein Medical Center in Philadelphia, is the extremely careful scientist, not the temperamental artist. Borrowing a technique space researchers use to take temperature readings of Venus, he photographs the human body's surface heat with a novel infra-red camera...
...president of Barnes Engineering Corp., which developed the camera, describes the picture taken on photographic film as a "thermal map of the skin." The instrument does not ir radiate the subject in any way. Instead, it scans the body surface for six to twelve minutes to register the invisible infra-red rays emitted by the body itself. Where blood concentrates close to the surface-in veins, infections or abnormally rapid growths-the skin runs a higher temperature and the thermogram shows a light spot. Where there are areas of low metabolism-such as hair and scars or inactive growths close...
...told the men on the mountain to begin talking into a microphone and modulating the infrared beam. The response came clearly across the cold night air and was picked up by the lab-top receiver. "I'm starting now." Those words had covered 34 miles, passing over an infra-red beam that carried only .005 watt of energy. It would take 1,500 such diode beams to equal the power used by a single flashlight bulb...
Potential Unlimited. For hours the scientists on Mount Wachusett declaimed joyfully over the remarkable beam. Next they turned on a TV receiver, tuned in a Boston channel and retransmitted the picture to the laboratory by infra-red rays. The results were more than satisfactory...