Knight's Mechanical Encyclopedia, P., Pho′to-me-chan′i-cal Print′ing.

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Pho′to-me-chan′i-cal Print′ing.

A general term embracing all photo-processes in which a printing surface is obtained without the intervention of handengraving. (See photo-engraving.) The processes are very various, and the results obtained are of several kinds.

1. The surface printing, allied to the lithographic, includes albertype, photolithography, photozineography. See, also, Autotype; carbon-printing; gelatine process; Heliotype.

2. The relief-printing produces plates which may be printed like type, and includes photogalvanog, aphy, phototype.

3. The intaglio printing includes the photoglyptic process.

4. See Woodbury process.

A succinet statement of gelatine and similar organic matter associated with bichromate of potash in photo-mechanical processes may be given as follows: —

1. Mungo Ponton, 1839, first discovered the sensitiveness to light of a sheet of paper treated with bichromate.

2. Becquerel, 1840, determined that the sizing of the paper played an important part in the change.

3. Fox Talbot, 1853, discovered and utilized the insolubility of gelatine exposed to light in the presence of bichromate.

4. Paul Pretsch, 1854, discovered and utilized the quality which such exposed gelatine possesses of not swelling in water.

5. Joseph Dixon, 1854, was the first to use organic matter and bichromate upon stone to produce a photolithograph.

6. Poitevin, 1855, was the first to recognize the fact that bichromated organic matter altered by light took the greasy ink from the roller.

7. Tessie du Motay and Marechal, 1864, were the first to print from a photographic image on bichromated gelatine as from a lithographic stone.

1877.

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Knight's Mechanical Encyclopedia
Knight, Ed.

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Pho′to-me-chan′i-cal Print′ing.

Knight's Mechanical Encyclopedia Knight, Ed.

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Pho′to-me-chan′i-cal Print′ing.

Knight's Mechanical Encyclopedia
Knight, Ed.