. The American stationer. beam of light passing througha transpaxent part of the negative (a line for in-stance), and impinging on the surface of a gela-tinized plate D. By the laws of optics it will onencountering the denser medium be refractedand spread over the gelatine as shown in thefigure producing chemical change over thepoints of impingement. If now this plate isswelled and cast in plaster, cement, wax, orsome other medium, lines of this character, onlyin relief, will be obtained and the resultantprinting block will possess this defect. The Fio. 4. duction work we have nothing to take
. The American stationer. beam of light passing througha transpaxent part of the negative (a line for in-stance), and impinging on the surface of a gela-tinized plate D. By the laws of optics it will onencountering the denser medium be refractedand spread over the gelatine as shown in thefigure producing chemical change over thepoints of impingement. If now this plate isswelled and cast in plaster, cement, wax, orsome other medium, lines of this character, onlyin relief, will be obtained and the resultantprinting block will possess this defect. The Fio. 4. duction work we have nothing to take the place ofphoto-engraving. The plates of the Americanedition of the Encyclopijedia Britannica arelargely reproduction by photo-engraving of theoriginal plates. For catalogue work, processwork answers very well, being cheap, and theyare more perfect in detail than the averagewood cut. As the real cost of an original photo-engravedblock is the drawing necessary; after this ismade, the rest of the process is comparatively. Fio, inexpensive. Now it often happens that two orthree sizes of the same cut are needed or slightvariations of the same cut are necessary, and itis just here that photo-engraving is ahead ofwood. As has been stated before, for reproduc-tion of wood cut prints, lithographs, steel orcopper plate proofs, working drawings, &c.,there is nothing to take the place of photo-workas it renders an exact fac-simile of the originaland at a much less cost than it could be copiedby any other method. They have not, however,as yet succeeded in producing any originalplates which will compare with the illustrationsin Dantes Inferno, The Wandering Jew,or The Ancient Mariner. There is a softnessof tone, a delicacy of touch, which the hand Fig, 5 temperature, then the oxide of tin, the white-burnt bones, or whatever else had been appliedas coloring additament would have been per-fectly dissolved in a white heat, but at a lowertemperature would have been for the most partagain sepa
Size: 2275px × 1098px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidamericanstat, bookyear1873
