Brass . 
10 $ 
Iron may be bronzed merely by rubbing it when hot 
with the hoof of a cow, and with dA.— Brews. Ency . 
The Gong is composed of 78 parts of copper and 22 
parts of tin. The Packfong is copper and tin with about 
one-third of nickeh 
Copper 'With Lead. 
These metals unite to appearance very intimately by 
fusion, but, what is very remarkable, when a mass of this 
alloy is exposed to a heat less than that at which the whole 
melts, the lead alone sweats out, leaving almost all the 
copper in a porous or honeycombed state. When the 
copper holds a small portion of silver, the lead carries the 
latter out with it, and this is the principle of the old pro- 
cess of eliquation , formerly much used in the extracting 
of silver from copper ores. Copper with about a fourth 
of its weight of lead forms pot-metal. The ancient Ro- 
man pot-metal, according to Pliny, was composed of 100 
of copper, 2 of lead, and 2 of tin. The same ingredients, 
but with more of the two latter, were the materials of ma- 
ny of the ancient Greek and Sicilian coins.— 1 Aik . 347. 
Ancient Weapons and Coins . 
The ancient weapons both shields and swords were for 
the most part made of copper hardened with tin. I re- 
collect but one place in Homer where iron is mentioned 
as the metal employed for the purpose, and that was the 
point of the spear, wherewith Pandarus wounds Menelaus. 
The word is, Sideron. II. 4. T. C. 
Hardening Copper.— In the second voh of this work, 
old Series, conducted by Dr. Coxe, is an account of Le 
Sage’s method of hardening copper by phosphorus. The 
process will succeed, but when so hardened, the metal is 
so brittle as to be fit for no purpose whatever. 
The same may nearly be said of the process of harden- 
ing and whitening copper with arsenic. Melt the cop- 
