THIS MONTH the world's largest physical science laboratory, the National Bureau of Standards, is dedicating its new facility at Gaithersburg, Maryland. We recently visited the 565‐acre site, to which most of the activities formerly housed on Van Ness Street in northwest Washington have been moved. In addition three major new facilities for which the old site was unsuited have been completed in Gaithersburg. These are a high‐intensity 100‐MeV electron linear accelerator (linac), a 10‐megawatt heavy‐water‐moderated reactor for materials research and a collection of highly accurate deadweight machines to calibrate force‐measuring devices.

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