. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Pio. 8.—Spring-tooth harrow. Fig. 9. —The Hoosier pressure-harrow. PUMPS, EECIPROCATING, 679 loosening the bolt and then retightening it, to maintain the normal depth of cut, so as greatly to increase the service of the teeth before exhausting all their available spring action. The grubber (Fig. 11) is distinguished by a pair of side carrier-wheels and a lead-wheel.

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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering