Horgan's half-tone and photomechanical processes .. . aster of paris, andwhen this latter mold is dry, casting a stereotype, which isthe printing-plate. Some of the peculiarities of this process are these: Inthe first place, when the swelling takes place in the gelatinthe tendency is to cup the sunken line which is laterthe printing surface. Each succeeding mold and cast hasa tendency to further round the printing surface so thatthe stereotyped relief line has a decided convex was taken advantage of by the printers who used theplates, because the lighter the pressure the thinner t
Horgan's half-tone and photomechanical processes .. . aster of paris, andwhen this latter mold is dry, casting a stereotype, which isthe printing-plate. Some of the peculiarities of this process are these: Inthe first place, when the swelling takes place in the gelatinthe tendency is to cup the sunken line which is laterthe printing surface. Each succeeding mold and cast hasa tendency to further round the printing surface so thatthe stereotyped relief line has a decided convex was taken advantage of by the printers who used theplates, because the lighter the pressure the thinner the linesin the impression; while to thicken the line, all that wasneeded was to increase the overlay and more of the convexsurface was impressed on the paper. Another peculiarity, which was a drawback, was thatthe thinner the gelatin film the better the result, but theshallower the plate and the more work for the engraver tolower the shallow surfaces between the printing of Moss earliest plates required engraving betweenalmost every Photo-Electrotype Engraving Company, about 1885. THE PHOTOELEGTROTYPE PROCESS, COMMONLY TERMED THE WASH-OUT PROCESS IN AMERICA ANDLEIMTYPE IN GERMANY. The photoelectrotype process was one that about 1880produced the best photoengravings, and it did not seem thatit could be superseded. It is now only a memory, and butfew of the old engravers are left to tell of the procedure. It was the method used to reproduce, among other books,the entire Encyclopedia Britannica, and also a WebstersUnabridged Dictionary. The publication of those worksalarmed compositors, who feared that the reproduction ofstandard works, in any size, by this photomechanical processwould bring ruin to the typesetter and some publishers. As this slow method of engraving has some good quali-ties it is liable to be rediscovered, as so many photo processesare, so a brief resume of the process is given here. The most successful method may be said to
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