"In the third place, the said Jethro Wood claims an exclusive privilege in the inventions and improvements made by him in the construction of the cutting edge of the mould-board, or what may be called, in plain language, the plough-share. The cutting edge consists of cast iron, as do the mould-board and land-side themselves. It is about twelve inches and one half of one inch long, four inches and one half of one inch broad, and in the thickest part three quarters of an inch thick. It is so fashioned and cast, that it fits snugly and nicely into a corresponding excavation or depression at the low and fore edge of the mould-board, along the side herein before termed the first side. When properly adapted, the cutting edge seems, by its uniformity of surface and evenness of connextion, to be an elongation of the mould-board, or, as it were, an extension or continuation of the same. To give the cutting edge firm coherence and connexion, it is secured to the mould-board by one or more knobs, pins or heads in the inner and higher side, which are received into one or more holes in the fore and lower part of the mould-board. By this mechanism, the edge is lapped on and kept fast and true, without the employment of screws. That the cutting edge may be the more securely and immovably kept in its place, it has a groove, or ship-lap of one inch in length, below, or at its under side, near the angle between the first and second sides, for the purpose of holding it, and for the further accomplishment of the same object, another groove or ship-lap, stouter and stronger than the preceding, is also cast in the iron, at or near the point of the mould-board, so as to cover, encase, and protect it effectually, on the upper and lower sides, but not on the land side. "After the cutting edge is thus adapted and adjusted to the mould-board by means of the indentations, pins, holes, ship-laps, and fastenings, it is fixed to its place and prevented from slipping back, or working off, by wedges or pins of wood, or other material, driven into the holes from the inner and under side, and forced tight home by a hammer. "In the fourth place, the said Jethro Wood claims the exclusive right of securing the handles of his plough to the mould-board and land-side of the plough by means of notches, ears, loops, or holders, cast with the mould-board and land-side respectively, and serving to receive and contain the handles, without the use of nuts and screws. For this purpose one or more ears or loops, or one or more pairs of notches or holders are cast on the inner side of the mould-board and land side, toward their hinder or back parts, or near their after margins, for the reception of the handles of the Plough. And these, when duly entered and fitted, are wedged in, instead of being fastened by screws.