1851 Great Exhibition: Official Catalogue: Class IX.: Richard Coleman
216. COLEMAN, RICHARD, Chelmsford — Inventor and Manufacturer.
Patent drag harrow and scarifier, for breaking up, clearing, and pulverising land. The frame at the top is suspended about six inches above the lower frame, parallel with which, by means of a lever, it is moved backwards or forwards; it is made with five or seven prongs, according to the width of land intended to be cut.
Patent drag-harrow and scarifier, on the same principle, with the addition of side levers, by which it is regulated when used on furrow land.
Patent subsoil harrow, for drawing out furrows, and grubbing or raising the subsoil after the plough.
Patent expanding lever-harrow. This implement is made in four compartments, each three feet, and being constructed on the principle of a parallel ruler, it may be expanded or contracted at pleasure: it is drawn by five chains attached to double hooks which move on the long whippletree.
Patent expanding harrow, constructed on the same principle, but without wheels and levers.