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Pre-serve′--jar.

A jar the mouth of which may be hermetically closed, both to insure the better preservation of the fruit and to prevent evaporation. Various devices have been contrived for effecting this object. In the example, a flanged packingring C accurately fits the mouth of the bottle; over this and within the flange is placed the cap B, which is forced tightly down upon an india-rubber gasket by the pressure of a screw so as to exclude the air. See fruit-jar.

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