One man, private Alexander Dunlop, in the machinery department, was the operator of an interesting experiment with an article of manufacture in which both England and France were concerned. The incident was related by Mr. Overend, at a public dinner, given at the Cutlers’-hall, Sheffield, to the Great Exhibition Local Commissioners for that town. Among the jurors there was a French Gentleman, who very properly showed great zeal in protecting the interests of his countrymen. He admitted that Sheffield had made the best files, but he maintained that there was a house in France that could make them incontestibly superior. He challenged Sheffield to the trial, and selecting the house with which he would make the test, it happened to be that of the Mayor of Sheffield, Mr. Turton, who accepted it. From France files were brought over for the purpose, and a French engineer was despatched across the Channel to use them. Messrs. Turton did not send to Sheffield to have files made specially for the occasion, but merely went to a London customer, whom they supplied with files, and took a few, indiscriminately, from his stock. Private Dunlop was chosen to use the English file against the French engineer and the French files made for the occasion. Two pieces of steel being selected upon which to try the files, they were fixed in two vices. The Frenchman was stripped to his work, with sleeves turned up, and all encumbrances likely to affect his strength and freedom of action, were removed. Dunlop was very differently garbed; his coat was buttoned up to the throat, and he was, in all respects, going, as it were, to parade. Both now, by a signal, began to work simultaneously, but Dunlop, a very powerful blacksmith, had filed the steel down to the vice before the French engineer had got one-third through. When the files were examined, that of Messrs. Turton was found to be as good as ever, while the French one was nearly worn out. The French juror then said no doubt he was beaten in that trial; but Messrs. Turton’s file must have been made to cut steel only, whereas the French file was better adapted for iron. A new trial then took place upon the iron, and the result was still more in favour of the English file. Footnote 85: ‘Fraser’s Magazine.’ Footnote 86: This gave offence to one London periodical—the ‘Builder’ (April 5, 1851, p. 212). Its antagonism, however, is consistent, for it has always advocated that the services of the sappers should be confined purely to military duties, and that the national surveys, &c., should be wholly controlled and regulated by civil energy and operation. Still, with all its opposition, it spoke of the sappers at the Exhibition, in a qualified sense, as intelligent and efficient. Footnote 87: ‘First Report,’ p. xxxvii. Footnote 88: ‘First Report,’ App., vi., p. 49. Footnote 89: