” Boh the Manufactures of Iron and Stecl. ° 351 
ge L 
About the year 1620 charcoal pig iron fold for perton6 © 
In the year 1792, carbonated pig iron 4 8 io 
In the year 1798 ditto, ditto - =" 6 tg 
Coak pig iron when invented fold at 1 4 0 
In the year 1792 melting pig iron fold for - 5 10 
In the year 1798 ditto - ade et 7 10 
Malleable iron made with charcoal fold for - - 15 © 
The fame in 1792, to be drawn into wire, for - 23 0 
Ditto in 1798 - - = 55 3629 0128-0 
The firft bar iron made (1620) with pit-coal fold for 12 0 
The fame iron in 1792 fold for - iy ee 
Ditto in 1798 for é u 5 icici 
By thefe ftatements it may be feen that all along there 
has been preferved an analogy between the value of the re- 
fpective ftates of the metal. We cannot, however, be but 
aftonifhed at the mighty advance on iron within the laft fix 
years, nearly and in fome cafes more than equal to the ad- 
vance of a-period of 170 years before. 
Let it be taken for cranted, that the manufaéture of En- 
gland, Scotland and Ireland at the beginning of the 17th 
century amounted in crude iron to 180,000 tons. 
142500 tons of which, fuppofe, produced 75000 _ 
tons bars at 15/7. Amount s £,-1,125,000 
67500 tons caft into guns, mortars, fhips’ bal- 
laft, &c. &c. at rol. - = 675,000 
oe Oe 
180000 tons, amount of the manufactures of 
iron at that early period = - £.1,800,000 
——__. 
In Britain at prefent the total produce in pig iron does not 
exceed 100,000 tons; and reckoning on an ayerage that 
33 cwt. of crude iron produces 1 ton of bars, and that the 
manufacture of malleable iron amounts to 35,000 tons per 
_ annum, 
57752 
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n 
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