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Bead proof

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Bead proof \Bead" proof`\
   1. Among distillers, a certain degree of strength in
      alcoholic liquor, as formerly ascertained by the floating
      or sinking of glass globules of different specific
      gravities thrown into it; now ascertained by more accurate
      meters.

   2. A degree of strength in alcoholic liquor as shown by beads
      or small bubbles remaining on its surface, or at the side
      of the glass, when shaken.
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