Word: proof
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Dates: during 1930-1939
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...Manhattan, Davisson and his colleagues decided to find experimental proof of the de Broglie theory. If a beam of electrons could act like a beam of light, it should show a pattern of concentric rings when diffracted through a crystal. But the low-powered electrons (100 volts) which Davisson was using would not go through a crystal. He knew, however, that a beam reflected from the topmost atoms of the crystal structure would make a pattern similar to that made by a beam passing through. So he decided to explore the recoil pattern of electrons bouncing off the crystal surface...
Harvard University, by its willingness to sit down around a conference table with representatives of its employees has given ample proof. that it is a fully enlightened employer. Despite the fact that dining hall employees are paid full union wages, and that Harvard was unique in that it made no salary cut during the depression the waitresses have a legitimate demand in that they do not receive any tips. It is essentially this, together with the usual demands for recognition and a closed shop, that is being discussed in the conference now going on in Mr. Durant's office...
...Faculty idea that pure intellectual training and research should be the most important elements in the making of teachers shows to what degree the spirit of research has permeated University minds and out-balanced that of teaching. The weakness of the School in this respect appears one particular proof that the University is flying the wrong flag of educational emphasis...
...answers seem to please Elliott little more than the other men. Turning to the concrete material, Elliott finds that an elementary knowledge of statistics "would lead one to view with scepticism, if not with horror, the proof of Sorokin's pudding contained in such statistics of revolution and war as are produced in the third volume...
...proof that they are no more dishonest than the public, thieves often observe that of the pocketbooks thrown away on the street to avoid arrest, few are ever turned over to the police...