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Graph′o-type.

A process invented by Hitchcock, in which a zinc plate is covered with a thick coating of oxide of zinc, placed under an hydraulic press to made a perfectly plain and hard surface, the design drawn upon the oxide with an ink consisting of a chloride of zinc and a menstruum. This produces as to the parts where the ink touches a very hard material, the oxychloride of zinc. The remaining surface is rubbed away by brushes, velvet, and the fingers, leaving the lines in relief to be printed from.

The process is more used in England than in this country, though it is an American invention. The English illustrated paper, the “Graphic,” is understood to be largely illustrated by this means.

In one form of the process the adhering material is solidified by immersing it in a solution of silicate of soda.

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Alonzo Hitchcock (1)
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