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3rdly. The method of feeding the priming chamber by a sliding plate, as shewn.

[Inrolled, January, 1825.]

There are some parts of this invention closely resembling one of the plans proposed in Webster's patent for improvements on percussion gun-locks, see our third volume, page 72, and Plate V. fig. 11.

To STEPHEN WILSON, of Streatham, in the County of Surry, Esq., in consequence of communications made to him by foreigners residing abroad, for certain Improvements in Machinery for Making Velvet and other Cut Works.

[Sealed 7th October, 1824.]

THE intention of the patentee is to adapt a loom of the construction usually employed for weaving ribbons, to the production of narrow widths of velvet, and in which loom two ground warps are to be introduced with one pole warp between, for the purpose of weaving two pieces of velvet, face to face, at one operation; and by means of a contrivance for working a series of alternating knives, by the ordinary action of the treadles, the several pieces of velvet so made are to be cut asunder, and drawn off the loom, with the pile or face in a finished state.

Plate VIII. fig. 1, is a perspective view of a loom of the description proposed to be employed, in which the improved parts are but imperfectly exhibited, but are seen more distinctly in the detached figures. The harness of the loom is omitted in this figure to avoid confusion; a, a, is the batten, with two rows of shuttles

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which is said to be new only as applied to the weaving of velvet; b is the roll upon which the upper ground warp-threads are wound; c is the roller of the lower ground warp; and d is the roller of the pole warp. These three warps pass through reeds in the batten, which reeds must in this case be rather deeper than ordinary reeds, for the purpose of admitting the three warps. The shuttles are intended to move in double rows in the batten, but not exactly as in a ribbon loom, the cause of which and the mode of management to effect the proper operations, is stated to be well understood by the weavers of velvets.

The particular construction and intention of the new parts of the apparatus will be best seen and understood in the detached fig. 2, which exhibits a portion of the batten and breast rolls, with the warps, guides, and cutters, for a single operation; and fig. 3, which represents two leashes, with the three warps attached thereto, and passed through the guides.

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The upper and lower ground warps being passed through the eyes of the leash, e, and the pole warp through the leash, f, the up and down motions of the leashes, as in ordinary weaving, brings the pole warp alternately into connection with one or other of the ground warps, and the to and fro movements of the shuttles produce the intervention of the threads, that is weave the fabric double; the union of the two ground warps being effected by the traversing of the poll warp from the upper to the lower, consequently the threads of the poll warp produce the pile upon the inner surface of the two fabrics. The length of this pile will depend upon the distance at which the two ground warps are placed apart, and this is regulated by the guides, g. These guides also conduct the fabric

to the cutters.

The cutters are a series of knives mounted upon a board, h, fig. 2, which is made to traverse to and fro by a cord, i, i, i, passed over pulleys on the side of the loom, (see fig. 1) to the treadles at bottom; consequently the ordinary movements of the treadles cause this board, h, to slide to and fro laterally. The knives, k, are so placed that they intercept the middle of the woven fabric, and by cutting the connecting threads produced by the pole warp, as described above, split the upper and under portions of the fabric asunder, and leave their inner surfaces with faces of velvet, which are passed over separate rollers to distinct work rolls at the back of the machine.

A similar contrivance is stated to be applicable to the weaving of broad velvets, plush, shag, &c., but in that case, beside the obvious alterations in the batten, reeds, and shuttles, the cutter must be a long knife with a strong back, like a tenant saw.

The claims of novelty in this improved loom are, first, the arrangement of the ground warps one above the other, and the pole warp in the middle, which is common to both; secondly, the guides for conducting the warps, and regulating their distances apart; and thirdly, the knives or cutters for separating the fabric, and the mode of putting those knives in action.

[Inrolled, February, 1825.]

TO FREDERICK BENECKE, of Deptford, in the County of Kent, Verdigrise Manufacturer, and DANIEL TOWERS SHEARS, and JAMES HENRY SHEARS, of Fleet Market, in the City of London, Coppersmiths, in consequence

of a communication from a certain Foreigner, for certain Improvements in the Making, Preparing, or Producing of Spelter, or Zinc.

[Sealed 7th October, 1824.]

THESE improvements in the manufacture of zinc, con sist, first in the method of preparing the ores, previously to submitting them to the furnace; and, secondly, in the peculiar disposition of the retorts and their appendages within the furnace, by which the ores may be conveniently introduced, and submitted to distillation, and the product discharged in a pure state into receptacles on the outside.

In the ordinary modes of preparing the sulphate of zinc, or spelter, the ores are submitted to the furnace in a covered melting pot or retort, having a pipe in the bottom of the pot, which descends into a vessel of water, for thẻ purpose of receiving the metal, and condensing the vapours which accompany it; but by a patent obtained about fourteen years ago for improvements in the preparation of zinc, it was proposed, instead of carrying the other metals running from the ore, (such as lead) down the pipe with the melted zinc as above described, that the zinc should be volatilized and pass off from the retort in the state of vapour, leaving the other metals with the residuum in the retort. By the apparatus of the patentees, the latter process is employed, and the improvements, as above stated, consists in the preparation of the ores previously to introducing them into the retorts, and in the disposition of these retorts in the furnace.

Any of the zincs, or sulphates of zinc may be treated in this apparatus, even the poorest qualities of ore may be used; they are to be finely pulverized, as they mix best

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