Word: cm
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Dates: during 1950-1959
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...radio waves pass through cosmic dust clouds. By tracking the 21-cm. waves given off by hydrogen, radio astronomers have been able to probe deeper and deeper through the Milky Way toward the galaxy's center. Recently, Dutch Astronomers G. W. Rougoor and J. H. Oort of Leiden Observatory reported that they had been able to peer into the mysterious nucleus itself. They found there a strange pinwheel of rapidly spinning hydrogen...
...heart of Raytheon's projected system is an "Amplitron" tube, a chunky object 2 ft. high. The tube transmits as much as 25 h.p. on a beam of 10 cm. waves shot into the air by a dish antenna. A nest of these tubes can be focused at a point about 50,000 ft. up. Some of the beams' energy will wander off into space, but Raytheon scientists believe that a saucer-shaped receiver can capture 35% to 50%. Turned into heat, this energy could drive a gas turbine which would drive the helicopter blades...
This is just what happened. Photocells along the tube reported that a thin, luminous wave raced along it at 45-50 cm. per microsecond (about 1,000,000 m.p.h...
...happy chance, it turned out that the neon lamps light up when exposed to radar waves with a power density of only 5 or 6 mw. sq. cm.-about half the permissible dose for man. So they are perfect for the purpose, and last indefinitely, Dr. Johnson and two Navy medical colleagues report in the United States Armed Forces Medical Journal. Photo flashbulbs can also be used for a one-shot warning: they go off when exposed to still smaller doses of microwave radiation...
...Bonn Observatory called Jacchia's attention to the connection between solar radio wave data and the satellites' acceration. The very first hint Jacchia saw was that two peaks in an otherwise calm period occurred at the same time on both the satellite graph and the graph of 20 cm. solar radiation. With observations of 10.7 cm radiation transmitted daily from the National Research Council at Ottawa, Canada, he took a longer look, and found the amazing correspondence between solar emission and satellite acceleration reproduced above. This one-for-one relationship led him to form in December the daring conclusion that...