. The art of lead burning; a practical treatise explaining the apparatus and processes. assembling of the parts should be clear, withthe assistance of the perspective drawing of thecompleted apparatus, and any mechanic of ordi-nary ability should be able to construct this gen-erator without any trouble. The following- billof material should first be purchased: One ^-inch whitewood board lo inches wide and 8 feet 6inches long. One 3^-inch whitewood board 12 inches wide and 4 feet 6inches long. One piece of 6-pound sheet lead 3 feet wide and 6 feet 6inches long. Three ^-inch female hose end gas
. The art of lead burning; a practical treatise explaining the apparatus and processes. assembling of the parts should be clear, withthe assistance of the perspective drawing of thecompleted apparatus, and any mechanic of ordi-nary ability should be able to construct this gen-erator without any trouble. The following- billof material should first be purchased: One ^-inch whitewood board lo inches wide and 8 feet 6inches long. One 3^-inch whitewood board 12 inches wide and 4 feet 6inches long. One piece of 6-pound sheet lead 3 feet wide and 6 feet 6inches long. Three ^-inch female hose end gas cocks. One piece of J^-inch brass tubing 2 feet long. One foot of ^-inch lead pipe. One 4-inch charging screw. One 114-inch cleaning screw. Making the Charging and Cleaning Screws. These goods can be readily purchased fromdealers, with the exception of the charging and THE ART OF LEAD BURNING. 27 cleaning screws. They can be made in any brassfoundry. The only difference between the charg-ing and cleaning screws is the size. The charg-ing screw, Fig. 5, should be at least 4 inches in. Pis- 5-—T^^s Charging Screw. diameter, or large enough to pass the handthrough, while the cleaning screw should be i54inches in diameter, or large enough to pass overa I-inch pipe. A piece of sheet lead is fitted intothe cover, as shown at a, to protect the metal fromthe acid. Soft putty is used for a packing, asshown in Fig. 5. The best, although a more expensive, charg-ing screw is shown in Fig. 6. As will be seenfrom the cut, it consists of a base, k; cover, d;clamp, e, and screw, /. The base is simply aplain iron or brass ring, 4 inches in diameter, ^inch thick and i inch high. The bottom is to be 28 THE ART OF LEAD BURNING. faced smooth, while the top is recessed 3-16 inchdeep to receive the sheet lead and packing ofputty, as at a. Two nubs, b and b, are cast onopposite sides, as shown, to act as grips for theclamp c. These nubs are ^ inch long and projectout from the body of the base ^4 inc
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidartofleadburning00fayc
