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... It has been ascertained that an iron girder will break with about 400,000 changes of load, accompanied by vi- brations, a fact which but too clearly shows that the spon- taneous destruction of our iron bridges is but a question of time, and that not a very long time. THE WAGES OF THE WORKING CLASSES.—The'facts and figures arrived at lately by Mr. Leone Levi and Mr. Bass, respecting the wages ...