10 



respectively^ all by Yorkshire manufacturers. The weight 

 required to draw them asunder by a steady direct tension was 

 not very variable ; but when all were cut round to the same 

 depth, for the purpose of being broken with the hammer, 

 they required about the following blows to do so : — 



Blows. 



Cold blast iron 6 



Scrap 3 



Hot blast 1 



The second and third set of bars you have now before you, 

 the results of experiments on which stand thus : — 



Blows required to 



Diara. of bar. Area of sec. break them with a 

 in. where cut. 171b. hammer. 



Low Moor, cold blast ... 2.66 3.976 18 



Bierley, cold blast 2.75 4.430 18 



Milton, hot blast 2.75 4.430 3 



Blows required to 

 break them with 

 a 201b. hammer. 



Elsecar, cold blast 2.58 3.976 2i 



Milton, hot blast 2.58 4.203 ^ .. 1 



Made from the same materials. 



So that the proportionate resistance of hot blast wrought iron 

 to impact is still less than that of cast iron. I need scarce say, 

 that the result was that cold blast iron was ordered at proba- 

 bly £6 per ton more than the hot blast iron might have been 

 bought for. 



I may here take leave to mention the circumstance of 

 scrap iron being anything now but what it was formerly, when 

 its name was synonymous with excellent quality. In former 

 times the importation of scraps from the Continent of Europe 

 took place to a very considerable extent, all of which were 

 manufactured in this country into bars, sheets, &c. ; and from 

 the circumstance of these scraps being all of charcoal iron, 

 the bars, &c. so made could not but deserve the good name 

 they acquired and long maintained. The flow of scraps into 

 England has, however, long since ceased, and the exportation 

 from this country having become a considerable trade, it 



