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Excerpt from A Dictionary of Arts, Manufactures, and Mines, Vol. 2 of 2: Containing a Clear Exposition of Their Principles and Practices Knife-cleaning. - Specimens of those very useful machines which have lately been introduced for cleaning knives and forks are to be found in the building, and demand some notice. Mr. Kent's machine consists of a box or case, containing a couple of wooden discs, fixed near to each other upon a horizontal iron rod or spindle, which passes through the case, and is caused to rotate by means of a winch-handle. Each disc is, for about three-fourths of the area of its inner face, covered with alternate rows of bristles and strips of leather; and the remaining fourth part is covered with bristles only. The knife-blades to be cleaned are introduced through openings in the case, between the rubbing surfaces of the discs; and rotatory motion being given to the discs by a winch-handle, the knives are rapidly cleaned and polished. The machines exhibited by Mr. Masters are constructed upon the same plan as the above; but the rubbing surface of each disc is formed of strips of buff leather, with only a narrow circle of bristles around the edge of each surface, to clean the shoulders of the knives; small brushes are fixed beneath the holes in the case, through which the blades of the knives are inserted, to prevent the exit of dust from the apparatus. Mr. Price exhibited a machine for cleaning knives, and another for cleaning forks. The knife-cleaner consists of a horizontal drum, covered with pieces of leather or felt, and fixed within another drum or circular framing, lined with leather or felt. The knives are introduced through openings, in a movable circular plate, at the front of the outer casing, and enter between the surfaces of the two drums. The plate is fixed upon a horizontal axis, which extends through the case, and is furnished at the back With a handle; by turning which the disc is caused to rotate and carry round the long r