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A major role of the national standards labs is to keep the world's clocks running on the proper time. That means making a continual comparison of the primary clocks that are used as the standards. But some of the accuracy achieved in a given lab's measurement of time is lost as that information...
P erhaps because we are constantly bombarded by sound, it is easy to forget that sound waves actually represent quite small pressure variations. The sound of a jet engine a few meters away measures only about 20 Pa (about 0.0002 atmospheres). As one increases the energy going into a sound wave,...
T hroughout 1995, speeches, articles and symposiums celebrated the 50th anniversary of Science—The Endless Frontier; , known more familiarly as the Bush Report, in honor of Vannevar Bush, its principal author. While all the commentators recognized the report as the centerpiece of post‐World...
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