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The Collaborative International Dictionary of English v.0.48 (gcide)

Eudiometer \Eu`di*om"e*ter\, n. [Gr. ? fair, clear weather, fr.
? fine, clear ( said of the air or weather) -meter: cf. F.
ediom[`e]tre.] (Chem.)
An instrument for the volumetric measurement of gases; -- so
named because frequently used to determine the purity of the
air.
[1913 Webster]

Note: It usually consists of a finely graduated and
calibrated glass tube, open at one end, the bottom; and
having near the top a pair of platinum wires fused in,
to allow the passage of an electric spark, as the
process involves the explosion and combustion of one of
the ingredients to be determined. The operation is
conducted in a trough of mercury, or sometimes over
water. Cf. {Burette}. Ure's eudiometer has the tube
bent in the form of the letter. U. Eudiometric

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