458 Mr. J. Taylor's Lectures on Metallurgi/. 



The quantity raised in the last year, he stated, was about 

 10,000 tons, which, however, is less by near 1000 tons than 

 the preceding year, the falling off being owing to the unfa- 

 vourable effect of a low price upon some of the deep and ex- 

 pensive mines. 



About 8000 tons of copper, or 4"-5ths, are produced in Corn- 

 wall, and the remainder in Anglesea, Devon, Ireland, and 

 Staffordshire. 



In the year 1800 the quantity of copper raised in the Cornish 

 mines was between 5 and 6000 tons; so that there has been an 

 increase since that time of from 2 to 3000 tons. 



The value of the whole quantity of copper in its unmanu- 

 factured state is about one million. 



The lead of Great Britain probably amounts to from SO to 

 32,000 tons. 



The northern parts of the kingdom, Cumberland, Durham, 



and Northumberland, produce 12,000 tons 



North Wales and Shropshire 8,000 



Yorkshire 4,500 



Derbyshire 4,000 



Scotland, Devon, Cornwall, & South Wales 3,000 



31,500 



The value of the lead is altogether about 750,000/. 



Tin, as before stated, is only found in Cornwall and Devon, 

 and the quantity has fluctuated from 2800 to 5000 tons in the 

 year ; of late we may reckon it at somewhat above 3000 tons, 

 and on the increase, m consequence of an advance in price. 

 The whole value is about 400,000/. 



We have also certain quantities of zinc, manganese, silver, 

 antimony and cobalt ; but of these it is difficult to estimate the 

 quantity or value. 



The aggregate value of the metals of the kingdom is thus 

 more than four millions, but is increased enormously when 

 manufactured; and they (the metals) are the foundation of im- 

 portant branches of our commerce in our unrivalled fabrica- 

 tion of hardware. 



Iron is exported to almost all parts of the world in its raw 

 as well as in its numerous states, and in an infinite diversity of 

 useful and ornamental forms, which it would be tedious to at- 

 tempt to desci'ibe. 



Copper is employed largely in its simple state, particularly 

 rolled into sheet; ;ind is also very much used in mixture with 

 other metals, it being the principal constituent in brass, gun- 

 metal, and pot-metal. The town of Birmingham alone is said 



to 



