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Additional info for A Manual of Photo-Engraving

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B. Shults. MANUAL OF PHOTO-ENGRAVING. 31 have certain changes produced in If the whole plate is exposed, it is evident that the change will be uniform over the whole surface, but if only certain actinic rays, will its sensitive constituents. portions are exposed, the change will take place in only those parts and the intensity of the change will be proportionate to the intensity of the action If, therefore, such a plate of the light upon them. exposed in a camera properly focused upon some from the object will affect the sensitive salts in the film and produce an image corresponding in its parts to the various portions of the object.

MANUAL OF PHOTO-ENGRAVING. 31 have certain changes produced in If the whole plate is exposed, it is evident that the change will be uniform over the whole surface, but if only certain actinic rays, will its sensitive constituents. portions are exposed, the change will take place in only those parts and the intensity of the change will be proportionate to the intensity of the action If, therefore, such a plate of the light upon them. exposed in a camera properly focused upon some from the object will affect the sensitive salts in the film and produce an image corresponding in its parts to the various portions of the object.

Is added In the gelato the solu- tion, thus directly forming the sensitive compounds within it, which, being held suspended in a finely divided condition, are said to be in a state of emulsion. If, now, we have spread over a plate of glass, or other suitable substance, a coating in which the sensitive salts of silver have been formed, we will have a film which, upon exposure to light containing ZINC ETCHING — ORDINARY OUTLINE NEWSPAPER CUT. From drawing by A. B. Shults. MANUAL OF PHOTO-ENGRAVING.

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