Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 815
centrate weight and compres.^ the soil more compactly in proportion to weight. Ineach j)air the front roll is arranged to press comparatively lightly and prepare the surface ofthe ground for heavier pressure from the second roll, leaving it more even than single rolls.The roils are hollow, to save… … Fig. 3. —Ciarlvs seed-harrow.
Mechanical engineering
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