. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . PLOWS. 635 new parts. With the malleable iron frog an unskilled person can place the new parts withordinary home tools. Composite metal is used with singular success for the share and breastof plows, made by superposing molten crucible steel in a layer on a red-hot malleable founda-tion. The ingots thus produced are used in the manufacture of shares, the inner layer ofsoft iron permitting the tempering of the share
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . PLOWS. 635 new parts. With the malleable iron frog an unskilled person can place the new parts withordinary home tools. Composite metal is used with singular success for the share and breastof plows, made by superposing molten crucible steel in a layer on a red-hot malleable founda-tion. The ingots thus produced are used in the manufacture of shares, the inner layer ofsoft iron permitting the tempering of the share hard without crackling or distortion. Someof the best plows are now made from rolled plates of cast-steel highly and evenly temperedand exquisitely polished. Fine, moist earth adheres more annoyingly to a soft, low-tempered. Fig. 2.—Hand plow. than to a hard-tempered surface passing through it. The mould-board particularly should,therefore, be not only well shaped but well tempered to scour and prove durable. Thelarge permanent plow manufacturing establishments now keep stocks of duplicate parts formodern-made plows, readily obtained and applied even years after the plow was made. Im-provement in outline also marks the products of all the great factories, as will be evident byinspection of the modern hand plow (Pig. 2). Deeres Riding Plow (Fig. 3) is a light, three-wheeled implement made of wrought andmalleable iron and steel. The wheels are steel and carry the heel of the land-side clear of thefurrow bottom, so that there is no weight except on the wheels. The swing of the tongue to
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
