Home instruction for sheet metal workers . hrough the lower flanges and placed between the laps form-ing the seam. The seam is then tacked with solder atintervals of \y2 in., as at a, b, c, etc. Using the hot copper andsolder the seam is thoroughly sweated with solder, being carefulnot to open the tacks until the previous soldering has cooled,and to hold the soldering copper in the position D, which allowsthe solder to flow forward in the direction of the arrow at e,and not as shown by E, which would allow the solder to flowaway from the seam toward /. 30 Home Instruction for Sheet Metal Worke
Home instruction for sheet metal workers . hrough the lower flanges and placed between the laps form-ing the seam. The seam is then tacked with solder atintervals of \y2 in., as at a, b, c, etc. Using the hot copper andsolder the seam is thoroughly sweated with solder, being carefulnot to open the tacks until the previous soldering has cooled,and to hold the soldering copper in the position D, which allowsthe solder to flow forward in the direction of the arrow at e,and not as shown by E, which would allow the solder to flowaway from the seam toward /. 30 Home Instruction for Sheet Metal Workers When soldering the seam the copper is held in the right hand,with the tinned surface upward, and the solder in the left; thesolder is placed on the copper as often as required, or until theproper amount has been transferred to the seam. After it hasbeen thoroughly sweated small ridges of solder are carried to theseam with the point of the copper, until it has the corrugatedappearance in A, B, Fig. 27. In sweating and placing the ridges. Fig. 27. The Appearance of the Solder on a Properly Soldered Upright Seam. the solder should be placed on the seam as at C, bearing in mindwhat was said in connection with Figs. 21 and 22. To make aneat finish the copper is run down each side of the finished seamto make a straight line, as indicated by a b, Fig. 27. At theschool in New York one of these seams is made by the instructorfor a sample and other is made by the student until a perfectseam is produced. The home student must be careful to judgehis work or have a competent workman do it for him to be sureit is properly done. At the school after this work has been passedand initials are marked on it, all working tools are put in thelocker and preparations made to begin pattern drafting. CHAPTER V. Drawing Tools and Uses. If the home student has no drawing instruments he shouldobtain those illustrated in Fig. 28, which shows the draftingtools required and the method of using them. The dr
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