'iS'i MOULDING AND CASTING. 



soldered; })lacing a little solder upon the joint, 

 apply it upon a large piece of charcoal, and, with a 

 blow-pipe and lamp, blow upon it the flame until it 

 melts the solder. 



To cleanse Silver or Gold after it is soldered. 



Make the silver red hot, and let it cool ; then 

 boil it in alum-water, in an earthen vessel, and it 

 will be as clean as when new. If gold, boil it in 

 urine and sal ammoniac. 



A Solder for Lead, 



Put two parts lead to one part tin: its goodness 

 is tried by melting it, and pouring the size of a 

 crown-piece upon the table ; if it be good, there 

 will arise little bright stars in it. Apply resin when 

 you use this solder. 



A Solder for Tin. 



Take four parts of pewter, one of tin, and one 

 of bismuth ; melt them together, and run them 

 into narrow thin lengths. > 



A Solder for Iron. 



Nothing here is necessary, but good tough brass, 

 with borax applied, mixed with water to the con- 

 sistence of paste. 



MOULDING AND CASTING. 



The art of taking casts or impressions from 

 pieces of sculpture, medals, &c. is of very great 

 importance in the line arts. 



