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 706
Fig. 3.—Ball bearing. Fig. 4.—The Acme harrow. of the same class the ball bearing exhibited in Fig. 3 (shown with side-plate removed), whichdiminishes the wear and eases the draft. … Fig. 5.—Bradleys harrow. The Acme harrow (Fig. 4.) includes the functions of clod-crushing and pulverizingplowed ground. The front cutters are deflected to one side, and the rear cutters to the other.
Mechanical engineering
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