By Grard C.
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Mm. (9-52 tons per sq. ) Elongation : 9 % . Cold work 300 % :— Elastic Limit: 17-5 kg. per sq. mm. (11-11 tons per sq. ). Tensile Strength: 18-0 kg. per sq. mm. (11 -43 tons per sq. ). Elongation: 6 %. (i) Merely cold working to the extent of 50 % has completely changed the properties of aluminium, and the Elongation has been reduced t o a quarter of its original value. Consequently, if work hardening is undesirable, even a very small amount of deformation must be avoided, since the changes in the properties t a k e place very markedly from the outset.
Per sq. mm. (5-72 tons per sq. ). Elongation : 40 %. Cold work 50 % :— Elastic Limit: 12-0 kg. per sq. mm. (7*62 tons per sq. ). Tensile Strength : 14*0 kg. per sq. mm. (9-09 tons per sq. ) Elongation: 11 %. Cold work 100 % :— Elastic Limit: 14-0 kg. per sq. mm. (8-89 tons per sq. ). Tensile Strength : 15-0 kg. per sq. mm. (9-52 tons per sq. ) Elongation : 9 % . Cold work 300 % :— Elastic Limit: 17-5 kg. per sq. mm. (11-11 tons per sq. ). Tensile Strength: 18-0 kg. per sq. mm. (11 -43 tons per sq.
F) United States and Canada. The output of the United States and of Canada in recent years has been about 30,000 t o n s ; it is capable of great development, b u t it is difficult to give precise details on the subject. The " Rapport sur Flndustrie fran£aise " of the Minister of Commerce gives, as a probable figure for 1917, 70,000 tons, which might rise to 80,000 with further increase in prospect. The two large American companies are t h e Aluminium Company of America, and the Northern Aluminium Company 14 ALUMINIUM AND ITS ALLOYS of Canada, having their main works at Niagara Falls, at Massena, at Quebec a n d a t Sehawinigan Falls respectively.