The book of trades; or, Familiar descriptions of the most useful trades, manufactures, and arts practised in England : and the manner in which the workmen perform their various employments.
(undated, inscribed 1829)
The copperplate printer., pp. 38-39 ff.
38 THE COPPERPLATE PRINTER. THE Copperplate Printer transfers por- traits, landscapes, and a variety of other pictures, and writing, from engravings on copper to paper. The ink used for this purpose is a composition made of stones of peaches and apricots, the bones of sheep, and ivory, all well burnt; and, as the best which is used in this business, comes from Frankfort on the Main, it is known by the name of Frankfort black. It comes over in cakes, and being mixed with nut oil, that has been well boiled, it is ground by the printer on a marble. The rolling-press consists of two parts, the body and carriage; the body has two cheeks, or upright posts joined at top and bottom by cross pieces, and placed perpendicularly on a wooden stand or foot, which sustains the whole press. From this foot rise four other per- pendicular pieces, joined also by cross ones; this is the carriage, and bears a smooth even plank upon which the engraved plate is placed. When the plate is inked, the great art is in wiping it clean without taking the ink out of the engraving. Over the plate is placed the paper, previously moistened, and the arms of the cross are then pulled.
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