. The Photographic art-journal . er the influence oflight which has beenproved and establishedfrom a remote periodby chemists, is the fun-damental fact whichforms the basis of thePhotographic art. —Niepce, who at first employedplates of tin to receive thesensitive coatings, was led to^substitute in their place thesilver covering to obtain amore beautiful metallic surface,and also in order to obtain a dullblack instead of a reflective that period he was workingwith Daguerre. In employingthe method of the latter, founded upon theuse of the substances reduced to vapor, in-stead of the liqu
. The Photographic art-journal . er the influence oflight which has beenproved and establishedfrom a remote periodby chemists, is the fun-damental fact whichforms the basis of thePhotographic art. —Niepce, who at first employedplates of tin to receive thesensitive coatings, was led to^substitute in their place thesilver covering to obtain amore beautiful metallic surface,and also in order to obtain a dullblack instead of a reflective that period he was workingwith Daguerre. In employingthe method of the latter, founded upon theuse of the substances reduced to vapor, in-stead of the liquids which Niepce employ-ed, they confirmed beyond a doubt the ef-fects of the iodine and mercury. In allprobability it was Daguerre who alone dis-covered that series of remarkable opera-tions, which has since with justice assumedthe name of daguerreotype. Thus, the piocess of Daguerre consistsin formiag upon the surface of the silveritself the composition sensitive to high value of this metal, and thevol. v. no. i. 1. necessity of having it in the form of resistino- plates, in order that it mav be able toundergo the operations indispensable to theproduction of the images, have very natu-rally caused the employment of coppercoated with silver. It now becomes inte-resting to our readers, and useful, doubtless,to some, to become acquainted withthe manner in which this silver lining isfabricated, the various operations of whichI have been able to follow in the manufac-tory of my brother Alexis, and which Inow intend to describe to you in a veryfew words. FABRICATION OF THE PLATE. The double plate results from the pla-ting of a rectangular iuciot of red copper,about 4-5th of an inch in thickness, with asuperficies of 15j square inches, coveredon one of its faces with a fine leaf of silver,which by its relative thickness, gives theplate its title. In manufacturing thisdouble plate the quality of the copper isnot a matter of indifference, red or rosecolored copper should b
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectphotogr, bookyear1851
