pieces of stout plank extend across from side to side of this frame and are supported by pivots at each end. To the forward side of each plank are attached a row of triangular teeth which extend downward so as to furrow the earth in their progress. The teeth in each row are placed in front of the second and third rows of teeth by which it is thoroughly imbedded and the earth is smoothed by the roller-cylinder. The four harrow bars are not fixed permanently but are held in their proper positions by springs ; but not so strongly but that the harrow-teeth may give way and clear themselves
pieces of stout plank extend across from side to side of this frame and are supported by pivots at each end. To the forward side of each plank are attached a row of triangular teeth which extend downward so as to furrow the earth in their progress. The teeth in each row are placed in front of the second and third rows of teeth by which it is thoroughly imbedded and the earth is smoothed by the roller-cylinder. The four harrow bars are not fixed permanently but are held in their proper positions by springs ; but not so strongly but that the harrow-teeth may give way and clear themselves whenever they strike a rock or root so that the progress of the machine is not retarded. They are moreover s engine and the Rotary Plow (described in a former number) shall be fairly introduced and drawn by the economical Steam Carriage for fields per bushel., scientific american, 1846-08-06
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