the exhausting passage, a conical float valve is suspended in the cap, e, which as the metal rises, closes the aperture. It may be necessary to remark, that the valves of the air pump are not shewn, as that apparatus is already well understood. The patentee states, "It is obvious that moulds which are designed to cast articles, having irregular surfaces, such for instance as cannon that cannot be slidden out, must be constructed of parts put together, so as to render them air tight. Though I have shewn in the drawing a jacket surrounding the cylindrical part of my mould for the purpose of conducting cold water, yet I do not intend under all circumstances to employ that mode, but only when I desire to give the casting a case hardened surface." [Inrolled July, 1825.] TO WILLIAM HIRST, HENRY HIRST, and WILLIAM HEYCOCK, Woollen Cloth Manufacturers, and SAMUEL WILKINSON, Mechanic, all of Leeds, in the County of York, for their Invention of certain Apparatus for preventing Coaches, Carriages, Mails, and other Vehicles, from overturning. [Sealed 11th August, 1825.] THIS invention for preventing coaches, mails, and other vehicles from overturning, consists in the adaptation of a hanging arm on each side of the coach, with a small wheel at bottom, which arm, in the event of the coach being raised on one side, is instantly thrown out on ܝ܂ the opposite side, forming a prop or support for the body of the coach to rest upon, and which is thereby prevented from falling over. This apparatus is exhibited in Plate XII. at fig. 1, hanging by the side of a stage coach body; at fig. 2, an edge view of the same is shewn, and at fig. 3, the coach is represented as raised up on one side, and supported by the prop on the other side, which in this figure is seen resting upon the ground. The same letters refer to similar parts in all the figures; a, a, are the two arms of the hanging prop, which is suspended by knuckle joints at top; b, is a small wheel turning upon an axle, at the lower end of the hanging prop; c, c, are springs attached to the sides of the coach body, pressing against the back of the arms, a, a, for the purpose of forcing them outward, as seen at fig. 3; d is a small catch or hasp, which is fixed at the back of the prop, and by locking on to a lever bar, e, (see fig. 1), keeps the prop close to the coach in a perpendicular position, as at fig. 2. At the end of the lever bar, e, a rod, f, is attached by means of a joint, which rod passes up to the roof of the coach body, and has a catch in the box, g, that keeps it from falling until liberated. This catch is seen in the longitudinal section of the box, g, at fig. 4. In the middle of this box, standing across the roof of the coach, there is a recess; in which an iron or other heavy ball, i, rests, and when one side of the coach rises, as it would do in running over a bank or other elevation, the ball, i, immediately rolls to the lower end of the box, and striking against the catch at the top of the rod, f, pushes the catch from the edge of the plate, h, and allows the rod, f, to descend. By the descent of the rod, f, the lever bar, e, is allowed to fall, which liberating the catch, d, permits the springs, c, c, to |