02319 Cop"per*plate (?), n. (a) A plate of polished copper on which a design or writing is engraved. (b) An impression on paper taken from such a plate. note &hand; In printing from a copper- or steel plate the lines are filled with ink, the surface of the plate is wiped clean, the paper laid upon it, and the impression taken by pressing it under the roller of a plate press. /note Copperplate press. See Plate press, under Plate.
02311 Con"tact (?), n. [L. contactus, fr. contingere, -tactum, to touch on all sides. See Contingent.] 1. A close union or junction of bodies; a touching or meeting.2. (Geom.) The property of two curves, or surfaces, which meet, and at the point of meeting have a common direction.3. (Mining) The plane between two adjacent bodies of dissimilar rock.Raymond.Contact level, a delicate level so pivoted as to tilt when two parts of a measuring apparatus come into contact with each other; -- used in precise determinations of lengths and in the accurate graduation of instruments.
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