ABSTRACT
In a former article the reader has been made acquainted with the steam printing-press and other applications of machinery by which the impressions of a form of type, or of a pattern, can be rapidly multiplied. A mode of obtaining the mould has been already mentioned in connection with the Walter Printing Press, in the working of which the papier mache process is ingeniously made to supply the curved stereotype plates for the cylinders. A method of producing plates for the same purpose as the stereotype plates already described is by elecirotyping. The wooden blocks thus engraved would serve to produce a certain number of impressions, which could be taken off by careful hand-printing without perceptible damage to the block. The principle of chromo-lithography consists in printing on the same paper with inks of various colours from different stones successively, so as to produce, by the juxtaposition and superposition of the various tints, the effect of coloured drawing or painting.
