Paper And Printing Recipes a Handy volume of Practical Recipes Concerning the
Paper And Printing Recipes a Handy volume of Practical Recipes Concerning the
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In our eReader you can find the full English version of the book. Read Paper And Printing Recipes a Handy volume of Practical Recipes Concerning the Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Paper And Printing Recipes a Handy volume of Practical Recipes Concerning the
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An Improved Process of Photo-Engrav- ing. The metal plate, of cojjper or zinc, is coated with a very thin layer of bitumen of Judaea, and when tliis coat has become per- fectly dry, a film of bichromatized albumen is flowed over the plate. It is next exposed in the camera, and afterwards washed with water, in order to dissolve all the albumen which has not been rendered insoluble by the luminous action ; it is then treated with spirit of turpentine, which dissolves all those parts of the layer ...of bitumen that have become exposed. The plate can now be attacked directly by water acidulated with from four to six jjer cent of nitric acid. The great advantage of this method con- sists in the high sensitiveness of the bi- chromatized albumen, at the same time pre- serving the solid reserve produced by the bitumen of Judaea on a metallic surface. To Make New a Corroded Pen- When a pen has become so corroded as . To be useless, it can be made good as new by holding it in the flame of a gas jet for 32 PAPER AND PRINTING KKCIPES.
What to read after Paper And Printing Recipes a Handy volume of Practical Recipes Concerning the?
You can find similar books in the "Read Also" column, or choose other free books by J Ghersi to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
An Improved Process of Photo-Engrav- ing. The metal plate, of cojjper or zinc, is coated with a very thin layer of bitumen of Judaea, and when tliis coat has become per- fectly dry, a film of bichromatized albumen is flowed over the plate. It is next exposed in the camera, and afterwards washed with water, in order to dissolve all the albumen which has not been rendered insoluble by the luminous action ; it is then treated with spirit of turpentine, which dissolves all those parts of the layer ...of bitumen that have become exposed. The plate can now be attacked directly by water acidulated with from four to six jjer cent of nitric acid. The great advantage of this method con- sists in the high sensitiveness of the bi- chromatized albumen, at the same time pre- serving the solid reserve produced by the bitumen of Judaea on a metallic surface. To Make New a Corroded Pen- When a pen has become so corroded as . To be useless, it can be made good as new by holding it in the flame of a gas jet for 32 PAPER AND PRINTING KKCIPES.
What to read after Paper And Printing Recipes a Handy volume of Practical Recipes Concerning the?
You can find similar books in the "Read Also" column, or choose other free books by J Ghersi to read onlineMoreLess
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