. The art of lead burning; a practical treatise explaining the apparatus and processes. can be heateduntil fusion takes place nearly through the entiresheet. It is generally necessary to add lead tothe seam if it is desired to make the seam asstrong as the sheet it joins, unless the article tobe burned is of such a size as to be possible toallow of its being burned on both sides, whichmakes the strongest of seams. The lead for thebutt seams is prepared by rasping the edges ofthe lead sheet to be joined straight and true. , so that when the edges of the lead are broughttogether they will
. The art of lead burning; a practical treatise explaining the apparatus and processes. can be heateduntil fusion takes place nearly through the entiresheet. It is generally necessary to add lead tothe seam if it is desired to make the seam asstrong as the sheet it joins, unless the article tobe burned is of such a size as to be possible toallow of its being burned on both sides, whichmakes the strongest of seams. The lead for thebutt seams is prepared by rasping the edges ofthe lead sheet to be joined straight and true. , so that when the edges of the lead are broughttogether they will fit close its entire length. Theedges are then shaved for a distance of %inch each side of the edge, making a seam 54inch wide. On stock heavier than 12-pound THE ART OF LEAD BURNING. 8i sheets the edge should be shaved ojff, making adeep V-shaped groove, and the seams must bemade by adding lead. This allows the fusion totake place nearly through the sheet. The buttseam is the simplest form to burn, no matter inwhat position it is placed. The lap seam is the seam commonly used, and. Fig. 22.—Rasping the Edges of the Lead Sheet Straight and True. as between the butt seam and the lap seam thelatter is generally to be preferred. As it is notnecessary to cut and trim the edges true, it dis-penses with any additions of lead, except at rareintervals; it leaves the left hand free to handlethe shave hook, and the lap can be dressed to fitany uneven spots. It also makes the next bestseam to through fusing. By lap seaming a tankcan be lined in about half the time required to 82 THE ART OF LEAD BURNING. butt seam the same article, which is an importantitem to the customer. The lead for this form of seam is prepared,as its name indicates, by lapping one sheet^ to % inch over the other sheet. The underedges are to be shaved clean, as also the upperedge. The lead required to make the seam is
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