45 
the periodicals of the day, not only in England, but in Amer- 
ica, but he should not have thought it worth while to call the 
attention of the public to it, if it had not borne very much on 
what had been advanced by Mr. Leah and Dr. Alexander. Ex- 
periments had been made on this subject, and he could inform 
the public that castings generally made from iron produced by 
hot air, were £2 or £3 per ton worse than those made by cold 
air, and in many instances they were too dear to have them 
given. This was a subject of considerable importance to the 
public, particularly to the manufacturing portion of it, and, 
therefore, he had thought it his duty to state to them the 
grounds on which they stood in this respect. 
Mr. Embleton would take the liberty of inquiring 
whether there was any reliance to be placed on more recent 
experiments made on the relative strength of cold and hot 
blast iron ? — for he understood that the hot blast iron had 
been ascertained, by the experiments to which he alluded, 
to be of greater strength than even the cold blast iron of 
Byerley. 
Mr. Leah inquired, who were the parties making the ex- 
periment referred to ? 
Mr. Hartop replied that it was Mr. Fairbairn of Man- 
chester. 
Mr. Leah observed that experiments had been reported 
upon iron made at different works in the kingdom, and 
amongst the rest those of Low Moor and Byerley. The raw 
materials at both those places were exactly the same. The 
Low Moor Company were getting on one side the fence, and 
Byerley on the other, and yet the iron produced by the 
former was stated to be very considerably different from the 
latter, which was a strong proof that there was no depend- 
ence to be placed on these experiments. The locality 
proves this a real mistake ; though it must be admitted that 
the gentlemen of the north, of all ranks and degrees, combine 
every exertion of talent and ingenuity to establish the repute 
