246 Messrs. F. C. Calvert and R. Johnson on Alloys, 



Alloys of Aluminium and Copper. 

 To obtain these alloys, we had recourse to the same chemical 

 reaction as we employed to prepare those of iron, namely, — 



20 equivalents of copper 640 



8 equivalents of chloride of aluminium . 1076 



10 equivalents of lime 280 



We mixed these substances intimately together, and after 

 having submitted them to a high temperature for one hour, we 

 found at the bottom of the crucible a melted mass covered with 

 chloride of copper, and in this mass small globules, which on 

 analysis gave the following results : — 



Copper . . . . 91-53 

 Aluminium . . . 8*47 



100-00 

 which correspond with the formula : — 



5 equivalents of copper . . 160 = 91-96 

 1 equivalent of aluminium . 14 = 8-14 



1l74 = 100-00 

 We made another mixture of chloride of aluminium and cop- S 

 per in the proportions above stated, but left out the lime ; we ■ 



also obtained an alloy, which yielded the following results : — 

 Copper .... 87-18 

 Aluminium . . . 12-82 



100-00 

 which lead to the formula : — 



3 equivalents of copper . . 96 = 87-27 

 1 equivalent of aluminium . 14 = 12-73 



Ho = 100-00 



Alloys of Iron and Zinc. 



We also analysed a deposit formed constantly at the bottom 

 of a metallic bath, composed of melted zinc and tin, and which 

 is used for galvanizing iron. This deposit was found to be com- 

 posed of — 



Iron 6-06 



Zinc 93-94 





100*00 



which corresponds with the formula : — 



1 equivalent of iron ... 28 = 6'79 

 12 equivalents of zinc ... 384 = 93-21 . 



100*00 



