126 SEVENTH REPORT—1837. 
4. An analysis of a specimen of cast steel, manufactu « in 
the neighbourhood of Glasgow, from the best Dannemors ..on, 
was made by Mr, Tennent, and perhaps it may be worth while 
to state the results obtained. v 
Its specific gravity was 7'8125, and its constituents, 
Atoms. 
PURE i Sec uaiy a) = "oaae tae 
Manganese . . ». « . 0°:190 
RAtDOH.6itvl are, O8BS, <1; 
99°866 
Or it contains 56 atoms of iron united to 1 atom of carbon. 
He could not detect the least trace of either silicon or aluminum 
in this steel. Is it not probable that the reason why Danne- 
mora iron answers so well for making steel is that it contains 
no sensible portion of silicon and aluminum ; and that the pre- 
sence of a notable quantity of these substances in British iron 
is the reason why it is so ill fitted for being converted into good 
steel ? 
APPENDIX. 
A quantity of hot and cold blast iron was made in the same 
furnace at the Level Furnaces, Brierly Hill, Staffordshire, with 
the same proportions of ironstone and limestone, with the addi- 
tion of one-half more coal, necessary to compensate for the defi- 
ciency of power in the furnace when blown with cold air. These 
products were tried with the following results : 
1. Two bars of cast iron {ths inch square were melted in a 
crucible from pig iron, No. 1, the first cold blast and the second 
hot blast ; both broke when exposed to a pressure of 2040 lbs. 
2. Zths inch cable bolts were made from the hot blast iron 
No. 1. These cable bolts were exposed to the Liverpool proof, 
namely, a weight of 12 tons 5 ewt., without sustaining any al- 
teration; even a weight of 17 tons 18 ewt. produced no bad 
effect. 
Another chain without studs 3ths inch in diameter, made from 
the same hot blast iron, was proved to 22 tons, 7 ewt. 1 qr. 2 lbs., 
or to 12 tons, 11 ewt. 1 qr. 2 lbs. above the Liverpool proof, 
without sustaining any injury. These trials show that hot 
blast iron is at least as strong as cold blast iron. 
