Warburg, James P. (James Paul), 1896-1969 · [Boston] The First national bank of Boston · leaf 50
Engraving Plate. Engraving An infinite number of designs are printed, and the method of getting them etched on the copper roller is a fascinating one. A zinc plate iscarved by hand on a greatly enlarged scale from the original sketch,and from this plate the girls who operate the pantograph… … Transferring Design to Copper Roller. When the roller is placed in the pantograph it is coated with var- j^nish. As the girl traces the outlines of the design on her zinc plate Pantographwith a little pointer, she presses a treddle which brings a number oflittle diamond points in contact with the…
Cotton manufacture · Cotton trade
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