ss, rollers to run upon the mud or sand, and prevent the propel- according to the speed of rotation. On one of the collars, m, A new method, which is said to be both simple and cheap, lers and beams from entering too deeply into 1t. | there is a disk, m, against which a friction roller, o', carried… … finer structura] conditions, may be drawn off- propellers serving then to move the vessel. DREDGING APPARATUS. hand with the crayon on the prepared paper, This invention was patented through the after the outline has been transferred. Any Scientific American Patent Agency, Novem- correction or…
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