. Rudimentary treatise on agricultural engineering . reatstrength. A longitudinal feather stands in the place of a mould-board ; it has a strong pointed share, with a flat feather; ithas also a curved and self-cleaning coulter. The draught isapplied through a bridle and chain bar. Mr. Smith says itis intended merely to break up and stir the subsoil, withoutbringing it to the surface, or mixing it in the first instancewith the superincumbent soil; it is in fact a horse pick,and readily loosens and throws out all stones, not exceeding70 lb. in weight. It is drawn by four horses, two and twoabrea
. Rudimentary treatise on agricultural engineering . reatstrength. A longitudinal feather stands in the place of a mould-board ; it has a strong pointed share, with a flat feather; ithas also a curved and self-cleaning coulter. The draught isapplied through a bridle and chain bar. Mr. Smith says itis intended merely to break up and stir the subsoil, withoutbringing it to the surface, or mixing it in the first instancewith the superincumbent soil; it is in fact a horse pick,and readily loosens and throws out all stones, not exceeding70 lb. in weight. It is drawn by four horses, two and twoabreast, and is held in the usual way by one man. Inworking, the common plough goes before it, taking afurrow 10 inches by 6 inches, the subsoil implement follow-ing in the bottom of that furrow, and going deeper by10 or 12 inches. LIBRARY D 2 UNIVERSITYMISSISSIPPI 03 THE CHARLBURY SUBSOIL PLOUGH. THE BACKHEATH SUBSOIL PLOUGH. This is the invention of Sir E. Stracey. It is of a lighterdescription than the Deanston plough, and effects its object Fig. in a satisfactory manner. TVTien fitted -with wheels it makesa most valuable subturf plough, and is useful in a varietyof ways. THE CHABLBUEY SUBSOIL PLOUGH Is the invention of Philip Pusey, Esq., , and is intendedas a substitute for the Deanston plough. Mr. Puseys im-provements are described by him in an interesting paperin the Journal of the Royal Agricultural Society, vol. 433. He says, It struck me, therefore, that possiblythe discovery of Mr. Smith might be carried a littlefarther, and be brought more within ordinary means, ifwe could diminish the friction necessarily incurred inpassing through the unstirred subsoil by dispensing withmore parts of the common plough besides the mould-board ;and I determined to try whether, by combining in oneplough the two hitherto used, we might not get rid of thesole itself in the underground implement, trusting to theordinary sole above ground for preserving the balance, andso reduci
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