248 Messrs. P. C. Calvert and R. Johnson on Alloys. 



There is a fact which appears to us also worth notice ; it is, 

 that if we suppress from the above per-ceutages the proportion 

 of lead which tliey contain, and then calculate the zinc and tin 

 into new per-centages, we find that the results obtained perfectly 

 correspond with the quantities required to represent definite com- 

 pounds, or alloys having an equivalent composition ; in fact : — 



Although the quantities found by analysis so nearly correspond 

 with those obtained by calculations, still we hesitate to admit 

 that the metals composing the metallic bath exist in it in a state 

 of definite compounds, the more so as the equivalent of zinc is 

 so high comparatively with that of tin. 



Our object being to obtain cheaper alloys than those now in 

 use called brass and bronze, in which copper predominates, we 

 prepared several alloys in definite proportions, in which zinc 

 predominated. To obtain these alloys we melted tin, and added 

 gradually to it the zinc, or the zinc and lead, and then poured 

 this mixture into a melted mass of copper ; stirring the mixture 

 well and casting the whole into bars, we succeeded in obtaining 

 the following alloys : — 



No. 1. 



6 equivalents of zinc 

 1 equivalent of tin . 

 1 equivalent of copper 



No. 2 



10 equivalents of zinc 

 1 equivalent of tin . 

 1 equivalent of lead 

 1 equivalent of copper 



100-00 



100-00 



