. The book of photography; practical, theoretical and applied. alin. The gelatine solu-tion does not keep very well, so it is notadvisable to make it up in large quantitiesat a time. Rolling and Burnishing. Prints on albumenised paper, ,and collodio - chloride, if not glazed orenamelled, are generally finished by rolling or burnishing. These two operations areoften spoken of as one, but strictly speak-ing they are quite distinct. Rolling con-sists of passing prints through a presshaving either two rollers or a roller and aflat plate, the polish resulting from thehigh pressure. Burnishing
. The book of photography; practical, theoretical and applied. alin. The gelatine solu-tion does not keep very well, so it is notadvisable to make it up in large quantitiesat a time. Rolling and Burnishing. Prints on albumenised paper, ,and collodio - chloride, if not glazed orenamelled, are generally finished by rolling or burnishing. These two operations areoften spoken of as one, but strictly speak-ing they are quite distinct. Rolling con-sists of passing prints through a presshaving either two rollers or a roller and aflat plate, the polish resulting from thehigh pressure. Burnishing is performed bydrawing the print between two heatedrollers, or between a roller and a heatedsteel bar. The surface of the roller, plate,or bar against which the face of the printis drawn of highly polished nickel. Bur-nishing gives a greater degree of polishthan that obtained by cold rolling. Thebar burnisher is better in this respect thanthe roller burnisher, but has the disadvan-tage that the prints require lubricating^and are more likely to be iig. 4U«.—Bar Buenishek. The Bar Burnisher. A typical pattern of bar burnisher, inwhich the upper roller may be raised,when it is desired to polish the bar,,is illustrated by Fig. 408. In usingthe bar-burnisher the face of the printand mount should be rubbed over im-mediately before burnishing with a lu-bricant consisting of a few shreds ofCastile soap dissolved in 1 oz. of methy-lated spirit. The bar must be made tho-roughlj clean and free from scratches byrubbing it from end to end with a pieceof No. 0 sandpaper glued to a strip ofwood. Replace the bar in position, andlight the gas beneath the hot plat-e, keep-ing the top roller free of the condensedwater constantly deposited on it. When theend of the plate hisses at the touch of the 284 THE BOOK OF PHOTOGRAPHY. moistened finger (for gelatine prints theplate should not be so hot), the burnisheris ready for use. See that the bar is pro-perly adjusted, level, and at the
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