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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
two small cranks, one of which produces a vertical and the other a lateral movement; the simultaneous operation of both cranks producing a circular, inclined, or any desired irregular motion of the pointer, which is thus made to follow copy. All the movements of the pointer are imparted, by means of a simple arrangement of levers, to a graver, which cuts or engraves the design upon the surface of a copper plate or block. At the Paris Exposition of 1868, an apparatus was exhibited by M. Gaiffe, of Paris, for engraving by electro-magnetism. It consists of two or more disks having their faces in the same vertical and their axes in the same horizontal plane. The graving tools are provided with diamond points, and are connected with the armature of an electro-magnet, and with a tracing-point in contact with the patternplate. The tracing-point and graver are caused to approach the centers of their respective plates by a gradual and uniform motion, forming a spiral of extremely clo