ALLOYS. 65 



Chinese silver, and No. 12 exhibited a fine silver-color. Eis- 

 ner ascribes the elasticity to the greater content of copper. 

 Nos. 13, 14, and 15, analyzed by Louyet, were used in Bir- 

 mingham for articles to be plated. 



Malleable Brass. — Eisner (Newton's Journ.) has prepared 

 malleable brass, by fusing together 60 pts. copper, and 40 

 pts. zinc. Great care is requisite in the heating, lest too 

 much loss of zinc might ensue, and thus render the process 

 unsuccessful. To obviate this difficulty, he advises the better 

 plan of substituting a proportional mixture of brass for the 

 zinc, and supplying the deficiency of copper. 



This alloy is close-grained, of spec. gray. 8.44 at 50° F., 

 very tough and malleable when heated. Its hardness = 4. 



Tungsten and Copper. — Dr. Percy (Ch. Gaz. vi.), who made 

 a series of experiments upon the subject, found that tungsten 

 does not, as was anticipated from its peculiar nature, impart 

 hardness to copper and protect it from oxidation. The essays 

 with brass, German silver, and other metals, gave similar 

 results. 



AUo^ for Bearings of Axles of Locomotives. — An alloy of 

 85 lead and 15 antimony is recommended to be cast in a box, 

 and then greased in the usual way with soda, tallow, and palm 

 oil. The part did not become warm, and the alloy prevented 

 the lateral vibrations. 



Alloys for Bearings of Rollers, Turning-latJies, Wagon- 

 boxes, ^c. — For heavy works, Tapp recommends lib copper, 

 3J oz. tin, and 4| oz. lead. The copper is first fused, the tin 

 next added, and lastly, the lead ; and, before casting, the whole 

 is well mixed. For smaller machinery with hand-power, the 

 best alloy is 73 pts. tin, 18 pts. antimony, and 9 pts. copper. 



Fenton recommends the following alloy as having proved 

 serviceable for bearings on English railroads : 80 pts. zinc, 

 5| pts. copper, and 14| pts. tin. It is 40 per cent, cheaper 

 than brass, may be fused in iron pots, and is a good alloy for 

 cocks. 



See a tabulated view of many alloys, employed in the arts, 



in different proportions, in the Polytcch. Notizblatt, 1847, &c. 

 f2 5 



