1 08 META LL UltOV. 



METALLURGY. 



Met'allurgy (Gr. metaUon, a metal, and ergon, a work). — The 

 art of obtduiing metals from their ores and preparing them 

 for the various uses to which they are applied. 



Af finage (Fr. offijier, to refine). — The art of refining metals 

 by the cupel. 



Amalgama'tion. — The process of separating gold and silver 

 from certain of their ores by dissoKing these metals in 

 mercury. 



As'say. — A term used to express those chemical operations 

 which are made to ascertain the quantity of metal contained 

 in ores, or to discover the value or purity of any mass of 

 gold, silver, or other metal. 



Case'-hardening. — The process of converting the surface of 

 iron into steel. 



Doc'imacy (Gr. doMmasia, an examination). — The act or the 

 art of examining by test ; applied, in metallurgy, to ex- 

 periments made to determine the nature and purity of a 

 metal. 



Docimol'ogy (Gr. dokimos, proved, and logos). — A treatise on 

 the art of (issaying or examining in metallurgy, chemistry, 

 obstetrics, etc. 



Eliqua'tion. — A separation of the different parts of mixed 

 metals by the difi'erent degrees of heat required to melt 

 them. 



Flux. — Reduction or conversion of ores to metal ; any sub- 

 stance or mixture used to promote the fusion of metallic 

 ores, as carbonate of potash, or iclilte flux, equal parts of 

 nitre and tartar deflagrated, or hlach flux, limestone, 

 fluor-spar, borax, and several metallic oxides. 



Hydro-metallurgy (Gr. hudOr, water, and metrdlurgy^. — The 

 act or process of assaying or reducing ores in the wet way, 

 or by means of liquid reagents. 



Lab'yrinth. — A series of canals through which a stream of 

 water is transmitted for suspending, carrying off, and de- 

 positing at different distances the ground ore of a metal. 



Proplas'tice. — The art of making moulds for castings. 



Pud'dling. — The process of converting cast iron into wrought 

 or malleable iron, by subjecting it to the continued action 

 of intense heat in a reverberatory furnace, with frequent 



