Word: cm
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Dates: during 1950-1959
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...moon and get a faint echo. The Signal Corps did it first in 1946, and even radio hams do it now. But dependable communication by lunar reflection is harder. The Signal Corps and its collaborator, Collins Radio Co. of Cedar Rapids, Iowa, use ultrashort waves (810 megacycles, 37 cm.) because they pass without much loss of energy through the ionized layers in the high atmosphere...
Success on 21 cm Band...
...solution inside the lower eyelid of his subjects, and another drop on a light scratch made on the arm with a hypodermic needle. If within 20 minutes the eye did not become red, itchy or swollen, and if the inflamed area on the arm was no more than 1 cm. in diameter, it was considered safe to give the subject a full shot of the antibiotic. Only one man had a mild unfavorable reaction to the test itself; of more than 1,300 others, 25 gave a danger-signal reaction. One of these, a soldier suspecting venereal disease, ignored...
...being freeze-dried (by a half-dozen methods), an attendant made fresh entries on a wall board in Dr. Hyatt's office, to expand the bank's current inventory to: 33 cortical strips, eight infant long bones, four straight pieces of chest artery, 39,354 sq. cm. of skin. The tissue bank will not take material from victims of infectious disease or cancer, has to rely mainly on victims of heart attacks and accidents. In five years it has taken material from 104 individuals, benefited about 1,000 patients of 150 military and civilian surgeons across...
...hydrogen clouds are moving, as they generally are, the radio waves that come from them are slightly longer or shorter than the standard 21 cm. This difference allows radio astronomers to measure the speed of the clouds. It also allows them to "see through" a cloud that is hiding more interesting clouds. All they have to do is to set their detecting apparatus to ignore the waves from the obscuring cloud and tune in the waves from the clouds behind it. Harvard's new telescope will be particularly adapted to this selecting process. It will also have sharper vision...