. The art of lead burning; a practical treatise explaining the apparatus and processes. nearly level with the leadsheets, and if a scratch cloth be rubbed over theseam all traces of the position of the seam willbe removed. To make a really strong seam it must be goneover with the flame at least twice, as after fusionof the edges takes place the flame can be usedquite strong without fear of the lead runningfrom the seam. Do not leave this seam until 3^ouare satisfied that it is nearly perfect. It is goodpractice, and every hour spent only makes themastery of the next feeam come so much morequic
. The art of lead burning; a practical treatise explaining the apparatus and processes. nearly level with the leadsheets, and if a scratch cloth be rubbed over theseam all traces of the position of the seam willbe removed. To make a really strong seam it must be goneover with the flame at least twice, as after fusionof the edges takes place the flame can be usedquite strong without fear of the lead runningfrom the seam. Do not leave this seam until 3^ouare satisfied that it is nearly perfect. It is goodpractice, and every hour spent only makes themastery of the next feeam come so much morequickly. Horizontal Butt Seam» This form of seam cannot be used to any ad-vantage on general work, but, like seams in other THE ART OF LEAD BURNING. 89 positions, it cannot always be avoided. The prac-tice sheets are prepared and tacked securely tothe board, as previously described, and are thenplaced in the position shown in Fig. 26. Theposition of the blow pipe is as shown at a. Theflame should strike the sheet nearly square. Theedge of the upper sheet should be heated first, and fb. Fis;. 26.—Burniiis. a Horizontal Butt Scam. as it brightens the flame should be directed ontothe edge of the lower sheet. If properly done,fusion will at once take place. The object sought is to get a light fusion be-tween the two sheets before attempting to burnthe lead clear through the seam. If this is notdone, the lead will run from the upper sheet andcause holes, or at least will seriously weaken go THE ART OF LEAD BURNING. the upper sheet, as shown in cross section at fusion is once obtained it is a simple mat-ter to go over the seam a second time, which canthen be fused clear through without much dan-ger of burning holes through the sheet. Leadcan be added in the same manner as in uprightseams if necessary. Inverted Butt Seam. This seam is used extensively in joining wastepipes which conduct the acid from tanks to thedrain. These pipes are usually in a horizontalposition and the sea
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