de either of iron or of wood faced with iron, and Jan. 5th, 1864, through the Scientific American is jointed to the harrow, B, behind, so as to move up Effect of Vibrations on Iron Girders. Patent Agency, by H. Sharp, and assigned to Brown and down easily. The harrow itself follows the clod- In the… … of January, This journal was established in 1845, and is un- doubtedly the most widely chculated and influential publication of the kind in the world. In commencing the new volume the publish- formation address J. M. Brown, 388 Broadway, New ing, and is so arranged that when it is desired to use ;…
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