. The Kodak Salesman. he yellowbox. Film quality concerns many fac-tors: selection and treatment ofraw materials, accuracy of machines,facilities for testing the product atevery stage. Three series of pro- 10 cesses are involved: making thebase, making the emulsion, com-l)ining the base and the emulsion. The emulsion is the sensitivecoating which records the imageand its nature determines the speedand latitude of the film in use. Butno matter how superior the emul-sion of Kodak Film is, it could notmake uniformly clear negatives norcould the negatives produce uni-formly satisfactory prints wer
. The Kodak Salesman. he yellowbox. Film quality concerns many fac-tors: selection and treatment ofraw materials, accuracy of machines,facilities for testing the product atevery stage. Three series of pro- 10 cesses are involved: making thebase, making the emulsion, com-l)ining the base and the emulsion. The emulsion is the sensitivecoating which records the imageand its nature determines the speedand latitude of the film in use. Butno matter how superior the emul-sion of Kodak Film is, it could notmake uniformly clear negatives norcould the negatives produce uni-formly satisfactory prints were nota correspondingly high qualityfound in the support, or film base must be transparent, andof uniform firmness and thickness. Film base is a product of cotton,but before any cotton can qualifyfor admission to Kodak Park itmust be cleansed, at the mill, liychemical means prescribed by us tofree it of gum, wax and other sub-stances that arent cotton. Purgedof such matter the cotton becomes v^^ KODAK SALESMAN. Coating machines, -which convert the dope into film base. absorbent, and thus it enters theKodak Park plant. There it is put through a dryerwhich rids it of all traces of mois-ture. Damp fibres do not respondto nitration, the next process, anduniform nitration is essential, ac-cording to Kodak Park purpose of the nitration isto make the cellulose (cotton) sol-uble. We watch the cotton, warback in the mill, to be sure of itspurity, and we make the acids our-selves to be sure of their we can always get even nitra-tion, which in turn is a guarantyof even solubility. After the cotton is nitrated it iswashed thoroughly for days anddays to remove all traces of uncom-bined acid. Then follows a dryingprocess after which it is ready tobe dissolved. Wood alcohol, made by the Ten-nessee Eastman Corporation, is thechief ingredient of the solvents. AVith these solvents the nitratedcotton is mixed until the result is aviscous liquid of the consistenc
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Keywords: ., bookcentury1900, bookdecade1910, bookidkodaksalesman192122canauo
