r 
Storer on the Alloys of Copper and Zinc. 425 
ot be obtained if metals are present which are camer g ste pg in all pro- 
portions — this alloy, in which event small particles of the forei 
found irregularly disseminated u upon the fractured surface of the tot ingot, 
Hadvafactores are enabled to ascertain at once whether or no a given sample of 
pper is suitable for the preparation of patel Whenever ‘J “ found that 
i $ ca btai 
founders, ka applied to some on use, No milar means of nonce the purity 
of the brass in question are kno 
“It does not appear—at all panes it has never been proved—that any serious 
injury results in practice from the use of = ate varied kinds of copper, so long 
as they ne oo desired fh ontaining Ped per cent of zine. 
“ r 
oO 
impurities br out the mass of alloy of which the sheet was formed ;* but the 
influence must regarded as being of very slight nee in comparison with 
the changes of TRON which have alr ready been discussed,” 
A detailed account of the method of analysis employed [humid assay 
by means of iron] and a list giving the composition of the different alloys 
examined, follows. As also, ‘commente upon the violent action which is 
observed when zine and copper enter into combination with each other, 
and upon the remarkable tendency to separate into o layers, according to 
their relative specific gravity, without pee? which these metals 
exhibit when not mixed together by stirri 
“It is doubtless this tendency of the peat to remain 2 atone in sep- 
arate layers when not subjected to agitation, which has led several chem- 
ists to believe oe ys alloys of copper and zinc are apt to siaeras 
eliquation into two portions respectively rich in copper and zinc; from 
which pe have inferred, as I have previously remarked, the existence o 
5 or 80 per cent of copper is a the color of which is a — 
* It is not impossible that the small slg tee pst silver which, as ii i wall know Bsa 0 
“Ww: ¢ ea 
asrit ee heb | ee easapond ape’ tnd remedy cae oe arab 
i and 
gormnote sv, that the great ereter pat oth of — Faber is kotha in thet ereeadion of t the 
alloy when the old metal is ft 
