Messrs. F. C. Calvert and R. Johnson on Alloys. 249 



No. 3. 



10000 100-00 



Alloys of Copper. 

 We also prepared a series of alloys in which copper predomi- 

 nated ; the modus operandi was the same as that adopted to pre- 

 pare the above, and we found them to be composed of,— 



No. 1. 



100-00 100-00 



The first alloy of this series, or one much approaching to it, 



IS already m commerce, and has been analysed by M. Riefi'el. 

 The second alloy has been introduced into commerce of late, 



and IS much valued by locomotive manufacturers for its extreme 



hardness. 



The third alloy is one not yet in commerce, but we believe, 

 from Its physical properties, that it will replace the second alloy 

 m many of its principal applications, and if so, it will prove an 

 advantage to trade, as it is a much cheaper alloy. 



We. were induced to try the action of various acids on the above 

 alloys ; for if they were simple mixtures of metals, there was no 

 reason why the metals composing them should not be attacked 

 though mixed together, as they would if they existed in a free 

 state ; whilst, if they were chemically combined, the action of 

 acids would be modified. The results, as far as we have pro- 



Phil. May. S. k Vol. 10. No. 66. Oct. 1855. S 



