. The Photographic art-journal . nd M. M. Niepce, Bec-querell, Hunt and others have effected the sameresults by means of chlorates and other salt solu-tions. There is no use in trying to hide thesefacts, or of denying that Mr. Hill may have beenlucky in discovering some process of like nature,but we do doubt his scientific ability to perfectwhat he has accidentally discovered. PRACTICAL TREATISE ON PHOTOGRAPHY UPONAND METALLIC PLATES. PAPER AND GLASS TRANSLATED BY MRS. A. L. SNELLTNG FROM THE FRENCH OF M. AUBREE, member of the Linean Society, Chemical and Physical, of Paris.
. The Photographic art-journal . nd M. M. Niepce, Bec-querell, Hunt and others have effected the sameresults by means of chlorates and other salt solu-tions. There is no use in trying to hide thesefacts, or of denying that Mr. Hill may have beenlucky in discovering some process of like nature,but we do doubt his scientific ability to perfectwhat he has accidentally discovered. PRACTICAL TREATISE ON PHOTOGRAPHY UPONAND METALLIC PLATES. PAPER AND GLASS TRANSLATED BY MRS. A. L. SNELLTNG FROM THE FRENCH OF M. AUBREE, member of the Linean Society, Chemical and Physical, of Paris. HE end which I proposeto myself in publishing myprocess for obtaining por-traits upon paper, is to putall photographists in theway of operating for them-selves, and of explainingto them all the difficulties that theywill daily meet in following the formu-las written in the journals, more orless intelligible. I have omitted all scientific digres-sion. I shall especially employ myself in?demonstrating to them the good conditions. of a practical manipulation, without whichit is impossible to produce anything satis-factory. I have left to the learned of ourcentury the honor of initiating them intothe secrets of the chemical compositionsand decompositions which take place dur-ing the preparations of the photographicpapers : of explaining the action of thelight upon the decomposable salts withwhich the paper is impregnated,—of teach-ing them to say which are the chemical andphysical phenomenas that take place inproducing the image. For myself, faithful to the plan which 42 The Photographic Art-Journal. January, I have traced out, I shall neglect nothingthat may enable all the photographers andall the amateurs in daguerreotype to obtaina proof every time. I shall indicate to thema process for giving to the positive proofsall the tints they may wish, from the redcolor to the fine black of the last shade has only been obtained bymyself: it gives so much vigor, and at th
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectphotogr, bookyear1851
