. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... eans of a chainand capstan worked by a horse, the machine itself be-ing fixed with strong iron anchors. This mode ofdraining is only adapted to clay soil, and is very cheap-ly performed, but is now little used since the introduc-tion of tile-draining. Fowlers Draining Plow, de-scribed hereafter, is a great improvement on the moleplow, and draws the tile-tubing into the channel asfast a
. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... eans of a chainand capstan worked by a horse, the machine itself be-ing fixed with strong iron anchors. This mode ofdraining is only adapted to clay soil, and is very cheap-ly performed, but is now little used since the introduc-tion of tile-draining. Fowlers Draining Plow, de-scribed hereafter, is a great improvement on the moleplow, and draws the tile-tubing into the channel asfast as it is made, forming a perfect drain by one op-eration. BAND AND COG WHEELS. Where great power is required, several wheels andaxles may be combined in a manner correspondingwith that of the compound system of levers alreadyexplained. In this case, the axis of one wheel acts onthe circumference of the next, producing a continuedslower motion, and increasing the power in a corre-Fig. 59. sponding degree. The wheels are made thus to act by meansof cogs or teeth, or of bands{Fig. 59). In ordinary prac-tice, however, combined wheelsare made use of to multiplycombined cog-wheeis. motion instead of to diminish. 80 MECHANICS. it, familiar instances of which occur in the grist-milland thrashing-machine. In connecting a system of wheels, the cord or strapmay he used where great force is not required, thefriction round the circumference heing sufficient to pre-vent slipping. Bands are chiefly useful where motionis to he transmitted to a distance; as, for example,from a horse-power without a ham to a thrashing-ma-chine within it. Liability of sliding is sometimes use-ful, by preventing the machinery from breaking whena sudden obstruction occurs. Where the force is great,the necessary tension or tightness of the cord producestoo great a friction at the axle. In such cases, cogs orteeth must be resorted to. The term teeth is usually applied when they areformed of the same piece as the wheel
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishernewyo, bookyear1854
