PROJECTS IN SHEET-METALWORK 243 



The tin is then cleaned by scraping if very dirty, or by the use 

 of a little muriatic acid, which may be put onto the surface of 

 the tin with a stiff feather. The flux is then applied and 

 solder run into the hole with the soldering-iron used as in sol- 

 dering a seam (A, Fig. 268). 



If the hole is too large to be closed with solder, a patch 

 must be applied and soldered on. B, Fig. 268, shows the hole, 

 and Fig. 269 shows it patched. 



212. Completing the Patch. 



1) Secure a receptacle with a cracked seam or a small hole 



FIG. 270. Shallow watering pan. 



and with a large hole 1/2 " or more in diameter. Prepare the 

 small hole (A, Fig. 268) for soldering, as described in Sec. 210, 

 and solder, as described there. 



2) Trim the large hole (, Fig. 268) with a pair of tinner's 

 snips (Fig. 263), either straight or curved, depending upon the 

 shape of the hole and the tin, whether flat or curved. 



3) Cut a piece of tin from an old can or a piece of sheet 

 tin the shape of the hole, but enough larger than the hole to 

 provide for a 1/4" or 3/8" lap all around the hole. Clean the 

 tin on the receptacle, and that of the patch also; apply the 

 fluxing material and solder, as described in Sec. 210. 



Problem No. 3: To Construct a Shallow Watering Pan for a 

 Chicken Coop (Fig. 270). 



