Specification of the Patent granted to HENRY MAUDSLAY, of Margaret-street, Cavendish-square, in the County of Middlesex; for certain Improvements in the Construction of Steam-Engines. Dated June 13, 1807.

With Plates.

To all to whom these presents shall come, &c. NOW KNOW YE, that in compliance with the said proviso, I the said Henry Maudslay do hereby declare that my said improvements consist in reducing the number of parts in the common steam-engine, and so arranging and connecting them as to render it more compact and portable, every part thereof being fixed to and supported by a strong frame, of cast-iron or other materials, perfectly detached from the walls of the building in which it stands, and thereby less expensive in fixing, and not liable to get out of order by the sinking of foundations, &c. The different arrangements and combinations I adopt are fully described by drawings of a one-horse steam-engine hereunto annexed, the same proportions being observed in engines of any power. Observe, the same letters refer to the same parts in each figure throughout the drawings.

Figs. 1 and 2 (Plates XIII and XIV.) represent a front and end elevation.

Fig. 3 a plan.

Figs. 4 and 5 are a sectional elevation and plan, shewing those parts which are unavoidably concealed in the foregoing figures.

Figs. 6 and 7 are certain parts on an enlarged scale, for the sake of illustration. A is the frame-work, of thin cast-iron. B are two cold water cisterns, of cast-iron, no larger than to admit of easy access to the pumps, &c.

therein

therein contained, and communicate with each other by a pipe a. C is the steam-cylinder, inclosed in a casing of copper or other materials b, having the intermediate space filled with wool, or some other bad conductor of heat. D the piston-rod. E the small rods. F a small groved wheel running between two guides ce, to preserve the perpendicular motion of the side rods. G the connecting rods. Ha three-throwed crank. I a small wheel or roller which works in the fork of, and gives motion to, the cross beam J, to which are attached the rods of the air, and hot and cold water pumps, K the fly-wheel fixed on the crank-shaft. L the condenser containing the air-pump M, simplified in its construction by forming the valves def of round metal plates; the two latter have holes at their centre e for the pump-rod to pass through, and ƒ for the stuffing-box. N the hot water cistern. O the hot water pump. P the cold water pump. Q the injection cock, adjusted at the index g, while the index h adjusts the steam-cock by cranks, leyers, rods, &c. R the steam-pipe from the boiler to the cylinder. S the eduction pipe from the cylinder to the condenser. T a four-way'd cock for making the alternate communications from the boiler to the upper and under side of the piston to the condenser, and is moved by an upright arm V, fixed on the cross-beam J, the motions of which are described in Figs. 6 and 7, when the pin i works in the crutch W, so formed as not only to move the cock at proper intervals, but almost instantaneously leaving it motionless during the remainder of the stroke.

In witness whereof, &c.

Specification