Horgan's half-tone and photomechanical processes .. . are heated to 86° F., and the bichromate slowly poured intothe gelatin solution; filter once and add the ammonia andglycerin and keep at 1040 F. in a dish. Float well-glazedpaper on this and dry in the dark. The dry paper is printedunder a half-tone negative until the image is plainly visiblein brown. The copper plate, having been cleaned with alco-hol and chalk, is taken into the darkroom, and the papercontaining the half-tone print and the copper are placedin a dish of cold water at the same time. When the paperbecomes flaccid it is float
Horgan's half-tone and photomechanical processes .. . are heated to 86° F., and the bichromate slowly poured intothe gelatin solution; filter once and add the ammonia andglycerin and keep at 1040 F. in a dish. Float well-glazedpaper on this and dry in the dark. The dry paper is printedunder a half-tone negative until the image is plainly visiblein brown. The copper plate, having been cleaned with alco-hol and chalk, is taken into the darkroom, and the papercontaining the half-tone print and the copper are placedin a dish of cold water at the same time. When the paperbecomes flaccid it is floated on the copper and squeegeedto it. After blotting off the water the plate is allowed tostand for a quarter of an hour until the swelling of thegelatin fixes the film firmly to the plate. The copper plateis then turned face down on hot water of 1050 F. until thepaper loosens, when it is carefully removed. The light-hardened gelatin adhering to the copper is then washedgently under the tap, dried, and the gelatin burned in as inthe enamel ORDINARY CROSS-LINE SCREEN. ROTARY PHOTOGRAVURE SCREEN. EVERY PROCESS PHOTOGRAPHER SHOULD BE FAMILIAR WITH THE FOLLOWING FACTS ANDFORMULAS. MUTILATION OF COPY BY ENGRAVERS. In one of the early numbers of The Inland Printer wasan editorial crying out against the mutilation of copy byengravers. One of the paragraphs was as follows: Noone who has much to do with ordering processwork canhave failed to remark the general disregard which engraversseem to have respecting the condition in which the originalcopy is returned to the customer. This fault is not the faultalone of cheap houses. It is prevalent among the best engra-vers, and it is as unnecessary as it is annoying. This editorial was copied into various trade papers anddid much to stop the evil. There is still opportunity forimprovement in this matter. There are still firms who per-mit their men to hammer a valuable drawing full of ten-ounce carpet tacks to secure it to the copy bo
Size: 2076px × 1204px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidhorganshalft, bookyear1913
