240 SHEET-METALWORK 



1 gasoline soldering torch, 



1 soldering iron, 



1 pair straight snips, 



1 pair curved snips, 



1 tinner's hammer, 



1 wooden mallet, 



1 carpenter's square, 



1 pair cutting pliers, 



1 pair dividers, 



1 punch, 



1 scratch awl, 



1 bar solder, 



1 piece sal ammoniac, 



1 bottle cleaning solution, 

 and tools shown in Fig. 263. 



210. Working Instructions for Lap Joint. On one 

 long edge of one piece of tin, scribe a mark \" from the edge 



U 



T 



i 



FIG. 264. Gage for making FIG. 265. Position of pieces for 



joints. lap joint. 



with gage of tin made as shown in Fig. 264. This \" surface 

 will form the joint (Fig. 265). Clean this surface and a cor- 

 responding one, not necessarily determined by a scribed line, 

 on the second piece of tin, by wiping clean and applying the 

 flux. Place the two pieces of tin together flat on a board so 

 that the surface of one piece of tin laps over on the surface 

 of the other, the edge of the first coinciding with the scribed 

 line on the second. The two pieces of tin now lap \" . 



