. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. EXAMPLE OF WORK WITH wheelers FINE GRAIN METZOGRAPH SCREEN. PRINTED BY THE ENAMELPROCESS, AND ETCHEDON COPPER. THE SCREEN. 33 are produced by depositing on a glass plate an opaquepowder in such a manner that transparent spaces ofvarying size will be left between the grain way is to flow the glass plate with an opaquevarnish so compounded that it splits up on dryinginto a reticulated grain. To give such screens agreater degree of permanency they have been etchedand filled in wi
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. EXAMPLE OF WORK WITH wheelers FINE GRAIN METZOGRAPH SCREEN. PRINTED BY THE ENAMELPROCESS, AND ETCHEDON COPPER. THE SCREEN. 33 are produced by depositing on a glass plate an opaquepowder in such a manner that transparent spaces ofvarying size will be left between the grain way is to flow the glass plate with an opaquevarnish so compounded that it splits up on dryinginto a reticulated grain. To give such screens agreater degree of permanency they have been etchedand filled in with black pigment in the same way asthe ruled screens, the grain first formed being of anacid-resisting nature. Such screens cannot be regarded as acting in thesame way as a ruled screen. They are placed asclose as possible to the sensitive plate, the use of acover glass not being permissible, and each grainpoint must be considered as an opaque obstructionto the light. The image spreads more or less accord-ing to the intensity of the light, so that in the highestlights all but the portions under the
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Keywords: ., bookcentury1900, bookdecade1900, bookidhalftoneproc, bookyear1904
