ings and trenails.-Sealed 15th February-6 months for inrolment.

William Scamp, of Charlton-terrace, Woolwich, surveyor, for an application of machinery to steam vessels for the removal of sand, mud, soil, and other matters from the sea, rivers, docks, harbours, and other bodies of water.-Sealed 16th February--6 months for inrolment.

William Samuel Henson, of Allen-street, Lambeth, engineer, for certain improvements in steam-engines.-Sealed 16th February-6 months for inrolment.

George Edward Noone, of Hampstead, engineer, for improvements in dry gas meters.-Sealed 18th February-6 months for inrolment.

William Orme, of Stourbridge, iron-master, for improvements in the manufacture of cofered spades, and other cofered tools.-Sealed 18th February-6 months for inrolment.

John Collard Drake, of Elm-tree road, St. John's Wood, land surveyor, for improvements in scales used in drawing and laying down plans-Sealed 18th February-6 months for inrolment.

Anthony Bernhard Von Kathen, of Kingston upon Hull, engineer, for certain improvements in fire-grates, and in parts connected therewith, for furnaces for heating fluids.-Sealed 22nd February-4 months for inrolment.

William Newton, of the Office for Patents, 66, Chancerylane, in the county of Middlesex, civil engineer, for improvements in the process of, and apparatus for, purifying and disinfecting greasy and oily substances or other matters, both animal and vegetable,-being a communication.— -Sealed 22nd February-6 months for inrolment.

Thomas William Booker, of Melin Griffiths Works, near Cardiff, iron-master, for improvements in the manufacture of iron.-Sealed 22nd February-6 months for inrolment.

Jonathan Guy Dashwood, of Ryde, Isle of Wight, plumber, for improvements in pumps.-Sealed 22nd February-6 months for inrolment.

Moses Poole, of Lincoln's-inn, in the county of Middlesex, Gent., for improvements in tanning, dressing, or currying skins,-being a communication.-Sealed 22nd February-6 months for inrolment.

John Dean, of Dover, chemist, for improvements in preparing skins and other animal substances, for obtaining gelatine, size, and glue; and in preparing skins for tanning. -Sealed 23rd February-6 months for inrolment.

Charles Sneath, of Nottingham, lace manufacturer, for certain improvements in machinery for the making or manufacturing of stockings or other kinds of loop work.Sealed 23rd February-6 months for inrolment.

THE

London

JOURNAL AND REPERTORY

OF

Arts, Sciences, and Manufactures.

CONJOINED SERIES.

No. CXI.

Recent Patents.

To ALEXANDER HETT, of Gower-street, Bedford-square, in the parish of St. Giles in the Fields, and county of Middlesex, surgeon, for certain improvements in the arrangement and construction of fire-grates, or fireplaces, applicable to various purposes.—[Sealed 23rd January, 1840.]

THIS invention of improvements in the arrangement and construction of fire-grates, or fire-places, consists in a peculiar disposition of the several parts of the fire-place, in order to economise fuel and heat, and raise and maintain the temperature of a room or chamber, at a considerable height or degree of warmth, without employing a very large fire. This object is effected by warming a stratum of air with the heat that would otherwise escape up the chimney without being used,—the air being afterwards, in a warm state, allowed to pass into the room or chamber.

VOL. XVIII.

I

Fig. 1, Plate IV., is a front view of a grate, having false or hollow sides and back, the under part or hearth also being made hollow. A pipe, in communication with the external atmosphere, conveys cold air into the hollow space before mentioned, in the back and sides of the grate; this air being brought into contact with the heated sides and back of the grate, becomes warmed, but not burnt, and in this state is allowed to pass through a conducting pipe, and escape through an aperture into the room; or the warm air may be conveyed through a pipe into a room above, or otherwise nearly contiguous.

Another arrangement is, where the cold air is warmed by the smoke and heat which escapes up the chimney. In this the air is made to traverse a series of bent pipes, extended across the upper part of the grate, and placed in about the same situation as the register plate of a grate of the ordinary construction.

Fig. 2, is a horizontal section of the upper part of the grate, shewing the arrangement of bent pipes, through which the air passes from the external atmosphere into the room or chamber that requires warming. The smoke and heated vapour, in proceeding up from the fire into the chimney, passes between these bent pipes, and thereby raises the temperature of the air contained within them, which is then conveyed from the pipes into the room; or otherwise in the same manner as in the former arrangement.

Fig. 3, is a section, taken transversely, of fig. 1, exhibiting the arrangement of pipes above, and also the hollow back and hearth. In all these figures, similar letters of reference mark the same parts of the fire-place. a, a, a, are the front bars of the grate; b, b, is the ash-pit; and c, c, the hollow hearth; d, & d,* the hollow back, which is divided into two parts by an upright partition e,—see fig. 4. A hole f, made in the upper part of this partition,