One ⅞-inch whitewood board 10 inches wide and 8 feet 6 inches long.
One ½-inch whitewood board 12 inches wide and 4 feet 6 inches long.
One piece of 6-pound sheet lead 3 feet wide and 6 feet 6 inches long.
Three ⅛-inch female hose end gas cocks.
One piece of ⅛-inch brass tubing 2 feet long.
One foot of ¼-inch lead pipe.
One 4-inch charging screw.
One 1¼-inch cleaning screw.
Making the Charging and Cleaning Screws.
These goods can be readily purchased from dealers, with the exception of the charging and cleaning screws. They can be made in any brass foundry. The only difference between the charging and cleaning screws is the size. The charging screw, Fig. 5, should be at least 4 inches in diameter, or large enough to pass the hand through, while the cleaning screw should be 1¼ inches in diameter, or large enough to pass over a 1-inch pipe. A piece of sheet lead is fitted into the cover, as shown at a, to protect the metal from the acid. Soft putty is used for a packing, as shown in Fig. 5.