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Atomic Hydrogen Maser Clock Model H-10 Robert Vessot--Varian Associates c. 1961 Atwood Collection 3229 Clocks similar to this one were used during the 1970s in experiments to prove Albert Einstein’s Special Theory of Relativity. Hydrogen masers are believed to be accurate to within 1/30,000th of a second per year. Photo by Dirk Fletcher |
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Copyright © 2002 Museum of Science and Industry, Chicago |