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Plan′ish-ing-ham′mer.

A planishing-hammer has smooth, very slightly convex faces, and is used upon sheet-metal in connection with a bright, steelfaced anvil. Its action is to condense and toughen the metal, and frequently to bring it into form, as in copper kettles, pans, etc. The face of the hammer is rounded more or less, according to the radius of the concavity of the vessel under treatment.

Heavy hammers of this description have a counterbalance suspension arrangement, to relieve the exertion of raising them after each blow, or are driven by machinery.

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