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Elatrometer

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Elatrometer \El`a*trom"e*ter\, n. [Gr. ? a driver + -meter.]
   (Physics)
   An instrument for measuring the degree of rarefaction of air
   contained in the receiver of an air pump. [Spelt also
   {elaterometer}.]
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