The Photographic Negative Written As a Practical Guide to the Preparation of Se
The Photographic Negative Written As a Practical Guide to the Preparation of Se
W H William Henry Burbank
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FIG. 19. It is simply a common steam cooker somewhat modified to adapt it to its new use. A is the hot water receptacle ; B, fit- ting tightly 'over A, contains the vessel in which the emulsion is placed ; d, d, are two small tin tubes soldered into B, which serve to convert the apparatus into a convenient washing ar- rangement. To construct the apparatus the perforated bottom is removed from B, leaving a margin of one-quarter of an incli around B to receive the movable plates used in the diffe...rent operations. The portion removed is used as a false bottom in A to prevent breakage of the various flasks which may be placed there. Its place in B is filled by a movable plate, F, pierced with holes. On this plate all the preparations are placed which are to be heated with steam instead of warm water. Three or four other metal plates are provided, of the form shown at E, with various sized openings. These are intended to THE GELATINE PROCESS. 95 hold funnels for warm filtration, or flasks containing solutions, the temperature of which requires careful watching.
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