A Manual of Photo-Engraving - download pdf or read online

By Harry Jenkins

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MANUAL OF PHOTO-ENGRAVING. 35 the salts have been added and dissolved, pour the gun cotton and shake This collodion will usually be found to work well in a few hours after making but should it fail to work clearly add a few flakes of iodine to turn toward a red color. Before using the collodion should be filtered through a tuft of absorbent cotton placed in the neck of a clean, dry funnel which solution into the solution of well. - , - , should be provided for this purpose alone. The collodion bottle should also be kept tightly corked, as the ether rapidly evaporates, leaving the collodion thick.

They should be kept in bottles corked or stoppered to prevent evaporation or deterioration. The bottles should be plainly labeled to prevent errors when the contents are wanted for use. tioned above should MANUAL OF PHOTO-ENGRAVING. CHAPTER 23 III. SHOP ARRANGEMENT. difficult matter to prescribe a set plan for IT thea arrangement of a photo-engraving- estabis such great variation in the rooms which may be selected for occupation, and as large shops require more extensive accommodations and special features which need not enter into the equipment of smaller lishment, as there size and is relative positions of concerns.

Veloper may be made up by measuring s. its The in de- strength which case it should register 20, and to each 20 ounces there may be added \ /> ounces acetic acid, and alcohol in sufficient quantity by the hydrometer, in l to make the solution flow readily. the sulphate is The action of to reduce the silver, as explained in preceding paragraph, the acid being used to retard its action and keep the image clear. Were a MANUAL OF PHOTO-ENGRAVING. the iron allowed to act alone it would cause a rapid reduction over the entire plate and The 37 the image.

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A Manual of Photo-Engraving by Harry Jenkins

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