Clod-Crusher.-This machine is used to break up the land which is of such a stiff nature as to remain in lumps or clods after ploughing. In the implement illustrated in Fig. 29, it consists of about two dozen circular cast-iron disks, placed loosely upon an axle, so as to revolve separately. Their outer circumference is formed into teeth, which crush and disintegrate the clods as they roll over the surface of the field. Every alternate disk has a larger hole for the axle, which causes it to rise and fall while turning over, and thus prevent the disks from. clogging.


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