This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
[Fr., from L. solidus.] Melted metal used for fastening pieces of metal together. Hard solder, for fusing at red heat, is composed of zinc and copper or silver and copper. Soft solder, for low temperature, in use among plumbers, consists of two parts lead and one part tin.
 
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