$3 
was $8,555. Similar establishments exist in Philadelphia^ 
and in the vicinity of this city. 
Brass guns, as they are styled, are formed from a similar 
compound ; the zinc is generally considered a useless addi¬ 
tion. They are cast at several founderies. 
The tinning of copper vessels for domestic purposes, is 
a common occupation. From the deleterious properties of 
copper, it has been proposed to substitute zinc ; and the pro¬ 
ject certainly deserves encouragement.§ 
Tin is found to have a great affinity for mercury, and has 
in consequence been used in silvering looking glasses. This 
trade is conducted to a considerable extent in our large 
cities. 
Traces of several other metals have been observed 
throughout the United States. 
Antimony has been found in the state of Connecticut, and 
indications of its existence are said to occur in the southern 
states and Louisiana. When it is recollected that in con¬ 
junction with lead, it forms typ.e metal , its value appears man¬ 
ifest. Without it the art of printing, an art, which rescued 
the world from barbarism, cannot be conducted.f 
Amine of Cobalt , combined with arsenick,has been discov¬ 
ered in North Carolina, and another of the same kind (\ white 
cobalt) exists at Chatham (Connecticut.) In its state of 
oxyd, this metal is used for giving various shades of blue to 
glass and enamel. All the zaffre and smalt (the names by 
which it is known in commerce) used in this business are at 
present made in Germany.* It is contemplated to com¬ 
mence a manufactory of smalt at the North Carolina mine. 
Manganese in the state of black oxide, has been discover¬ 
ed at Ancram4 and several other places in this state, and 
molybdena exists in various situations. Arsenical fiyrites are 
found in the district of Maine. To Mr. Hatchett we are in- 
§ Various proportions of copper and tin, form bronze and spec¬ 
ulum metal. 
t Chaptal mentions that the best proportion for type metal is 
80 parts of lead, and 20 of antimony. The antimony renders the 
compound harder, but if too much be added, it becomes brittle. 
* Vide Rees’ Cyclopedia, art. cobalt , for a detail of their man-’ 
ufacture ; also Nicholson’s Dictionary of Chemistry. 
t By Dr. Bruce, vide Med. Repository, vol. 11, p. 442. 
