256 



SHEET-METALWORK 



3) Solder seam on box after it is folded into shape of square. 



4) Fold edges and corner laps on bottom, place in position 

 on box, and solder in place, including corner laps. 



5) Construct cover for box by following description for 

 making the body of box. 



225. Stovepipe Collar (Fig. 294). 

 1) Lay out pattern for cylindrical part of collar, allowing 

 3/8" for lap to be riveted. Rivet joint. 



FIG. 294. Stovepipe collar. 



2) Lay out pattern for flange of collar a ring, outside 

 diameter, 6", and inside diameter, 4". Scribe a 4-7/8" circle 

 on this ring. Clip several narrow notches on inside of ring 

 limited by the scribed circle. 



3) Fold notched part of ring into cylindrical part of collar 

 and pound in contact with same over cylindrical stock. 



4) Solder or rivet two parts of collar together. 



