. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 6.—Gales harrow. to neutralize tendency to ridge the soil. The angle of the cutters is adjustable, and they arereversible, doubling their service. Bradleys steel lever-harrow (Fig. 5) will serve to illus-trate the improvement by which the entire harrow-frame, connected throughout by a series otpivoted rods, is manipulated by levers to incline the pitch of the teeth backward, thus chang- 678 PULVERIZERS AND HARR
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fig. 6.—Gales harrow. to neutralize tendency to ridge the soil. The angle of the cutters is adjustable, and they arereversible, doubling their service. Bradleys steel lever-harrow (Fig. 5) will serve to illus-trate the improvement by which the entire harrow-frame, connected throughout by a series otpivoted rods, is manipulated by levers to incline the pitch of the teeth backward, thus chang- 678 PULVERIZERS AND HARROWS. ing the implement from a stirring to a smoothing harrow, or causing the removal of anygathered trash from the teeth. Another form of the same class of lever-harrows is shown in Pig. 6. and is strongly madeof pipe passing loosely through transverse flat girts, each piece of pipe being connected byan arm pivoted to a horizontal bar, in turn pivoted to the hand lever for adjusting the pitchof the teeth. A lever-harrow by the Ray Implement Co., shown in Fig. 7, has a bearing. Fio. 7.—The Kay harrow. shoe at the corner of each section. In transporting this harrow, when it is not desired to operate it, the teeth are thrown back horizontally by the lever, and the corner shoes take the ground as runners. The H. P. Ueuscher Co. makes a harrow with sledge runners so arranged as to carry the implement folded and reverseil when transporting it not in use. The class of harrows represented by the Kalamazoo spring-tooth harrow (Pig. 8) is not oidy adapted by the yielding teeth to land that is obstructed by earth-fast stones and other objects, but, owing to the vibratory action of the helix spring-teeth, pulverizes the .soil thoroughly, shakes it up and leaves thodirt in a loose condition, shaking out weeds and grass upon the surface, leaving thom exposed to the sun to wilt and die. In operation the flattened frame pieces hold down the sods and clods, while the teeth cut deeply throug
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
