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Roll Film Tanks and Reels
Timers

Photography (Basic) - Introduction to photography and other graphic techniques
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Figure 10-5.–Film developing tanks. Figure 10-6.–Washing film in trays. scratched. Only line copy types of negatives are usually washed in a tray. The most effective washing method in a tray is when a siphon device is attached to the edge of the tray. The device siphons water from the bottom of the tray, while fresh water enters at the top (fig. 10-6). Because fixer is heavier than water, it sinks to the bottom of the tray. The best way to wash hand-processed sheet film (especially more than one sheet at a time) is in a sheet-film washing tank. Film hangers hold individual negatives  suspended  separately  in  the  tank.  Fresh  water flows into the bottom of the tank and runs out around the sides at or near the top of the tank (fig. 10-7). When you place the film hangers into the tank, ensure the negatives are separated, so sufficient fresh water reaches all  areas  of  each  negative. WARNING Figure 10-7.–Film washing tank Figure 10-8.–Rapid roll-film washer. 237.126 A rapid roll-film washer is excellent for washing hand-processed roll film. It is a cylindrical tank, large enough to hold several spiral reels. The washers come in a variety of sizes that will wash from two 35mm reels to as many as six or eight 120 reels (fig. 10-8). Aboard ship, hoses attached to potable water  spigots  can  back  siphon  chemicals  or wash water from the trays or sink into the drinking water supply. These hoses must have a backflow preventer installed in the plumbing The rapid roll-film washer is constructed so the system. wash water enters the tank at the base and flows up 10-13







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