"Furthermore, an additional property of his mould-board is, that, if it be measured and proved various ways, vertically and obliquely, by the saw in fashioning it, by the rule in meeting it, and by the chalk-line in determining it, the capital and distinguishing character of right lines existing on, over and along the peculiar curve which his mould-board describes, is always and inseparably present. This grand and discriminating feature of his mould-board, he considers as of the utmost importance. "He therefore craves the aid and elucidation of his drawing, and of his model, in their totality and in their several parts, to render plain and sure whatever there may be, from the abstruse and recondite nature of the subject, uncertain or dubious in the language of his specification. "In the second place, the said Jethro Wood claims an exclusive right and privilege in the construction of a standard of cast iron, like the rest of the work already described, for connecting the mould-board with the beam. This standard is broad, stout, strong; and rises from the fore and upper part of the mould-board, being cast with it, and being a projection or continuation of the same from where the fourth and fifth sides meet. Its figure, strength, and arrangement are such as best to secure the connexion, and to enable the standard thus associated with the beam, to bear the pull, tug, and brunt of service. By a screw bolt and nut properly adjusted above the top of the standard and acting along its side, assisted, if need require, by a wedge for tightening and loosening, the beam may be raised and lowered; and the mould-board, with its cutting edge, enabled to make a furrow of greater or smaller depth, as the ploughman may desire, and a latch and key fixed to the beam, and capable of being turned into notches, grooves, or depressions on one edge or narrow side of the standard, serves to keep the beam from settling or descending. By means of these screw bolts, wedges, latches, and keys, with their appropriate notches, teeth, and joggles, the Plough may be deepened or shallowed most exactly.