21 
Copper is also extensively used in combination with zinc, 
tin, and other metallic substances. These alloys, together 
with their application in manufactures, will be mentioned, 
after noticing the original metals. 
Zinc has been discovered in the state of Pennsylvania, in 
the form of sulfihuret , or blende as it is styled by mineralo¬ 
gists. It is found on the banks of Perkiomen creek, near 
Philadelphia.* Dr. Bruce lately analyzed an ore of this 
metal, brought from New-Jersey, and calls it red oxide of 
zinc. It is observed at various iron mines in that state. 
From the examination of that accomplished mineralogist, it 
appears that 76 parts out of the hundred are pure metal. 
He adds that it is preferable to other ores, since it forms 
with copper, an alloy superior in malleability and colour.f 
Zinc is imported from Europe under the name of spelter , 
which is a mixture of brass and zinc, and from India under 
the denomination of tutenage , which from analysis appears 
to be almost pure metal.| From the circumstance of its 
malleability at a high temperature, a property lately discov¬ 
ered, it is probable that zinc will become an important arti¬ 
cle in manufactures. Its principle use at present, arises 
from its combination with copper, forming the alloy, called 
brass. 
Tin is procured from England, South America and India. 
It is imported in the form of sheets, which is iron tinned 
over, or of block tin. From the first are manufactured ves¬ 
sels for culinary and domestic uses. This branch of indus¬ 
try is almost solely monopolized by the states of Connecti¬ 
cut and Massachusetts. It is estimated that in the former, 
tin plates and iron wire to the amount of $250,000, are an¬ 
nually used in this manufacture, and the annual value of the 
* Woodhouse’s analysis of the Perkiomen zinc ore, in Coxe’s 
Medical Museum, vol. 5, p. 133. Concerning blende, professor 
Jameson observes, “ it sometimes , though extremely rarely , is 
worked as an ore of zinc.” This probably sums up the contro¬ 
versy between Drs. Woodhouse and Seybert, on this subject, in 
Coxe’s Med. Museum, vols. 5 and 6. 
f Bruce’s M. J. No. 2, p. 96. 
t Chaptal’s Chemistry applied to the arts and manufactures, 
vol. 2, p. 210, Lond. edit. Vide a very curious correspondence 
on tutenage and spelter in the Med. Repos, vol. 15, p. 107. 
