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1 definition found
 for Proof stick
From The Collaborative International Dictionary of English v.0.48 :

  Proof \Proof\, a.
     [1913 Webster]
     1. Used in proving or testing; as, a proof load, or proof
        charge.
        [1913 Webster]
  
     2. Firm or successful in resisting; as, proof against harm;
        waterproof; bombproof.
        [1913 Webster]
  
              I . . . have found thee
              Proof against all temptation.         --Milton.
        [1913 Webster]
  
              This was a good, stout proof article of faith.
                                                    --Burke.
        [1913 Webster]
  
     3. Being of a certain standard as to strength; -- said of
        alcoholic liquors.
        [1913 Webster]
  
     Proof charge (Firearms), a charge of powder and ball,
        greater than the service charge, fired in an arm, as a gun
        or cannon, to test its strength.
  
     Proof impression. See under Impression.
  
     Proof load (Engin.), the greatest load than can be applied
        to a piece, as a beam, column, etc., without straining the
        piece beyond the elastic limit.
  
     Proof sheet. See Proof, n., 5.
  
     Proof spirit (Chem.), a strong distilled liquor, or mixture
        of alcohol and water, containing not less than a standard
        amount of alcohol. In the United States "proof spirit is
        defined by law to be that mixture of alcohol and water
        which contains one half of its volume of alcohol, the
        alcohol when at a temperature of 60[deg] Fahrenheit being
        of specific gravity 0.7939 referred to water at its
        maximum density as unity. Proof spirit has at 60[deg]
        Fahrenheit a specific gravity of 0.93353, 100 parts by
        volume of the same consisting of 50 parts of absolute
        alcohol and 53.71 parts of water," the apparent excess of
        water being due to contraction of the liquids on mixture.
        In England proof spirit is defined by Act 58, George III.,
        to be such as shall at a temperature of 51[deg] Fahrenheit
        weigh exactly the 12/13 part of an equal measure of
        distilled water. This contains 49.3 per cent by weight, or
        57.09 by volume, of alcohol. Stronger spirits, as those of
        about 60, 70, and 80 per cent of alcohol, are sometimes
        called second, third, and fourth proof spirits
        respectively.
  
     Proof staff, a straight-edge used by millers to test the
        flatness of a stone.
  
     Proof stick (Sugar Manuf.), a rod in the side of a vacuum
        pan, for testing the consistency of the sirup.
  
     Proof text, a passage of Scripture used to prove a
        doctrine.
        [1913 Webster]

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