COKE 



Mils 



COKE 



Vnlur of Korrtitn Coin* 



(c) copper; (g) gold; () silver 



stamped to indicate its weight, purity and 

 value. 



Comparative Values. The monetary units of 

 foreign countries with their values in United 

 States or Canadian money are found in the 

 above table. 



COKE, kohk. Bituminous, or soft, coal, 

 when burned with a limited supply of air in 

 kilns, called ovens, produces a variety of char- 

 coal called coke. The best ovens are long 

 and narrow and are heated by gas. As fast 

 as the charge is coked it is pushed out through 

 doors at the bottom and a new charge is put 

 in at the top. Coal tar, ammonia and gas are 

 obtained as. by-products in the manufacture 

 of coke. Some of this gas is used in heating 



the coke ovens, and the remainder is sold for 

 heating and lighting purposes. 



Good coke has a blackish-gray color, is 

 hard, brittle and porous. It burns without 

 flame or smoke and produces intense heat. It 

 is used in smelting iron ore, because it is free 

 from sulphur and other substances that injure 

 the iron. It is also used in melting metals for 

 casting and to an increasing extent in furnaces 

 for warming houses. Coke is manufactured 

 extensively in England, and in Western Penn- 

 sylvania, West Virginia and Tennessee in the 

 United States, and to a limited extent in 

 British Columbia. Not all bituminous coal 

 makes good coke, and coke ovens are located 

 only in those regions that have good coking 



