The largest optical flats in the world
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H.L.
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Article
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1926
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Elsevier Science
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English
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Sept.,i926.] NELA RESEARCH LABORATORY NOTES. 379 support itself. If now both impulses produce at the same time the same displacements, but of opposite sign, the vibrating instrument part will stay quiet, e indeed may become negative e = arctg 2L d~ โข