PROJECTS IN SHEET-METALWORK 245 



214. Laying Out and Cutting Tin to Shape. With 

 carpenter's square, or with try-square and rule, lay out 

 rectangle, 10-1/4" x 8-1/4". Inside of this rectangle, scribe 

 lines with scratch awl and straight-edge (leg of carpenter's 

 square), 1-5/8" from and parallel to outside edges of this 

 rectangle. Scribe lines in the corners for portion to be cut 

 out. Turn the piece of tin over and scribe lines 1/8" inside 

 the rectangle and parallel to the outside edges. 



With straight snips, cut out the corners, as shown in the 

 drawing (Fig. 271) : also cut to the corners of the inside rect- 

 angle, formed by the first lines scribed, on the lines marked 

 heavy on the drawing and lettered a. 



jSurfa.ce folded under 

 xntii in contact with the tin 



FIG. 272. Details of soldering watering pan. 



215. Folding. Over the edge of the piece of hard wood 

 or straight-edged piece of iron, fold with a mallet the 1/8" of 

 tin between the outside edges and the lines scribed 1/8" from 

 same. These surfaces must be folded toward the surface of 

 the tin on which the lines were scribed 1/8" from the outside 

 edges. Fig. 272 shows the folding operation. Pound these 

 surfaces down until they are in contact with the sheet of tin to 

 form the strengthened edges of the pan (Fig. 270). 



In like manner, but in the opposite direction, fold over the 

 corner of the piece of hard wood or straight-edged piece of 



