red hot, through iron pipes, direct to the furnace. Lastly; I lengthen the rim of the metal from the furnace to the metal pits.

I further declare, that the drawing annexed represents the ground plan and section of the said calciners and furnaces, with a front view thereof; and that the component parts are referred to as under.

AA, Fig. 1, (Plate XIV.) two calciners, elevated above the furnace. B the furnace. C the furnace stack. D the side door of the furnace. E the front door of the furnace. F the fnrnace tap hole. G the furnace grate. H the metal pit. I the trough, or rim, from the furnace to the metal pit. K three flues to calciner and furnace stacks. L the furnace charge hole. M, 2 the calciner stacks. N, 8 the calciner doors. O, 4 pillars, one between two calciner doors. P, 2 the calciner grates, which I make smaller than commonly used. Q, 3 the ash-holes. R, 2 the arch-ways under the calciners. S the stage for calciner man. T, 4 the calciner charge holes. U, 4 the iron pipes for conveying the ore or metal when calcined into the furnace. V. 3 passages to side door, tap, and ash hole to calciners and furnace. W, 3 the calciner and furnace feeding holes.

And I also declare, that the following advantages are to be derived from my said invention: First; the same work may be done in less time, and with fewer furnaces. Secondly; there is no waste of ore or metal from removal. Thirdly; there is no explosion from the metal pit to injure the building. Lastly; there is a considerable saving of fuel, labour, and materials.

In witness whereof, &c.

Specification

Specification of the Patent granted to GEORGE SMART, of Ordnance Wharf, Westminster Bridge, in the County of Surrey, Timber Merchant; for certain Improvements in Machinery for grinding Corn and various other Artieles. Dated April 1, 1814.

To all to whom these presents shall come, &c. NOW KNOW YE, that I the said George Smart, in compliance with the said proviso, do hereby declare that the nature of my invention, and the manner the same is to be performed, are particularly described and ascertained as follows; that is to say: In order to reduce the labour in grinding, and adjust the power, to the required force, and also to simplify and reduce the expense in millmaking and grinding, so as to enable the farmer and housekeeper from being dependant on the present practice of grinding; every article required to be broke or ground, may be performed by the application of rubbers or crushers, resting on their fulcrums, and are pressed against the revolving body by means of levers, weights, or springs; the rubbers or crushers, acting each on a separate axle, will admit of any irregular surface, from a square to a circle, to revolve against them, as each can be loaded, more or less, by moving the weights on the levers farther or nearer to the fulcrum; or, if with springs, by screwing them more or less down, as may be required. The rubbers or crushers may be plain, grooved, circular sided, concave, or any other figure best adapted for the substance to be broke or ground. The square, or octagon, are best adapted for breaking cement-stones, bones for manure, chalk, mixing clay, mortar, &c. For breaking malt, beans, &c. one crusher is only wanted; Tt 2

but

but for wheat, oats, barley, rice, or any flour or meal, the more rubbers or crushers thè finer the article will be ground: and the more flats there are on the revolving body the more crushers can be applied to advantage. In witness whereof, &c.

Specification of the Patent granted to ROGER HASLEWOOD, of Great Russell-street, Bloomsbury-square, in the County of Middlesex, Ironmonger; for folding Screens, adapted to impede the Passage of Air, Smoke, Fire, and Light, applied to Fire-places, Grates, Stoves, Windows, and Doors, which I denominate "The improved folding Screen." Dated April 21, 1814.

To O all to whom these presents shall come, &c. Now KNOW YE, that in compliance with the said proviso, I the said Roger Haslewood do hereby declare that the nature of my said invention, and the manner in which the same is to be performed, are particularly described and ascertained as follows: that is to say: The patent folding screen is formed by any number of plates, or flat surfaces, of metal, or any other material, more than one in number, suspended from the various diameters of the circumference of a pulley or roller, having various diameters, and counterpoised by a power equal to the weight of the said plates; the result of which arrangement of parts is, that when any one of the said plates is moved by a force applied upwards or downwards the whole number will ascend or descend in such proportions of motion as the various diameters produce.

In witness whereof, &c.

Specification