258 



SHEET-METALWORK 



elbow together and solder. Note that seams of sections are 

 placed on opposite sides of elbow. 



227. Roof Ridge Flange (Fig. 296). 



1) Lay out cylindrical pattern (Fig. 297). Determine 

 length of lines, as in pattern for conductor (Fig. 295). 



FIG. 296. Roof ridge flange. 



2) Lay out pattern for flange, notch and punch holes for 

 rivets, unless solder alone is to be used to fasten it to cylinder. 



3) Fit cylinder and flange together, bending flange to proper 



FIG. 297. Details of roof flange. 



angle for roof. Rivet or solder cylinder seam and rivet or 

 solder flange to cylinder. (These joints may be both sol- 

 dered and riveted.) 



228. A Measure (Fig. 298). 



1) Lay out pattern for bottom, as in Problem 5. Fold over 

 edge. 



2) Lay out pattern for body, as in Problem 6, for upper por- 

 tion of funnel. Solder lock seam. 



3) Lay out pattern for rim of measure, regarding it as a cone 



