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Scientific American, Vol. 100, No. 7 (February 1909) (1909)

leaf 4

An illustration from Scientific American, Vol. 100, No. 7 (February 1909), 1909, leaf 4
and better access to fixed upon disks of iron the different parts of the plate. The disks are set engine. in motion by means of a gear drive at a moderate speed, and when the frame- Protective Coating for metals. work is lowered, the Steel, iron, bronze, brass, blades sink in the ground and copper… … Rear view. The ground is broken up by the radiating arms on the disks. brushing or spraying with be raised or lowered at a slightly acid solution of will, the earth can be cul- AN EGYPTIAN STEAM CULTIVATOR. copper sulphate and imme- tivated to any desired diately washing with water before the tin…

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