SOLDERING. 283 



then rubbed on, taking care that the projecting 

 parts receive more of the powder than the cavities, 

 to imitate the brightness on those parts of bronze 

 which are Hable to be rubbed. 



SOLDERING. 



Soldering is the art of joining two pieces of me- 

 tal together, by heating them with a thin piece or 

 plate of metal interposed between them. Thus tin 

 is a solder for lead; brass, gold, or silver, are sol- 

 ders for iron, &c. 



To make Silver Solder. 



Melt fine silver two parts, brass one part ; do 

 not keep them long in fusion, lest the brass fly oft' 

 in fumes. 



Ayiotlierfor coarser Silver. 



Melt four parts of fine silver, and three of brass; 

 throw in a little borax, and pour it out as soon as it 

 is melted. 



A Solder for Gold. 



Melt copper one part, fine silver one part, and 

 gold two parts ; add a little borax when it is just 

 melted, then pour it out immediately. 



The Method of soldering Gold or Silver. 



After the solder is cast into an ingot, it would 

 be more ready for use if your were to draw it into 

 small wire, or flat it between two rollers ; after that 

 cut it into little bits ; then join your work together 

 with fine soft iron-wire ; and with a camel's-hair 

 per.cil, dipt in borax finely powdered and well mois- 

 tened with water, touch the joint intended to be 



