When the points have been protruded through the net, so as to be under the edge of the presser bar o, an elevation on the cam w, operates through the medium of the parts before described upon the lever (c), and in forcing it outwards draws, by means of a link at its lower end, the tumbler (d) back to its former position.

This enables a strong spring (h) to force down the rest, so that its lower end presses upon the arm v, attached to the framing of the presser bar o, and by overcoming the resistance of the large spring, to cause the presser bar to descend. The edge of the presser bar bearing upon the points, depresses them, and with them the net, the depth of a mesh, so as to present the new row of meshes which the points occupy exactly opposite the heads of the needles to be operated upon as before.

The threads of silk, cotton, or other material, are given off from the roller L, by a slight movement, being communicated to the periphery of the ratchet wheel (i) fixed on its end. This roller furnishes the threads for forming the centre part of the stripe, and at the opposite end to that from which it is driven, communicates movement by means of wheel work to the second roller м, which is intended to furnish thread for the selvages of the stripes; and where rows of single stitches unconnected are intended to be wrought, one roller only is necessary.

It now only remains for to show how broad stripes of work may be produced, but the Patentee does not mean to confine himself to any particular plan, as various others may be equally effective. Upon the shaft B, are fixed two spiral worms, the one being a left handed thread, the other, a right handed one. In these worms the ends of a lever vibrating upon a stud in the bolt (k,) are alternately carried along, and cause the said bolt to slide in its staples at the same time. When one of the forks of the lever

arrives at the end of its worm, it bears against a slope or inclined plane, which lifts it out of its worm, and depresses the contrary end of the lever into action with the other worm; by these means the bolt (k,) is made to travel to and fro. The said bolt has a notched piece screwed on its upper edge, and on this piece, the horizontal arm of the right angle, lever 1, rests, whilst its perpendicular arm bears against one of the arms of the shaft T, which supports the guide bar.

Thus, when one of the elevations of the bolt (k,) forces up the horizontal arm of the lever (1), the perpendicular one shogs, or gives a lateral movement to the shaft т, and with it the guide bar, whereby the guides are made to operate upon a different set of needles to those which they last acted upon; and thus, the rows of stitches are variously interwoven, and connected with each other, as well as with the net producing different patterns. When the elevations upon the bolt terminates, a spring acting against the shaft T, forces it to slide back to its former place, and with it the guide bar and guides.

The Specification concludes, by saying, lastly, I wish it to be understood, that I do not confine myself to this particular contrivance, for producing varieties of work, as many others are equally practicable; but, I claim as my invention, the application of needles and guides in the way which they are used in the warp machines, to embroider, or produce upon, or in combination with lace net, and other fabrics, as a foundation, the different varieties of design, or pattern, commonly produced by the well known warp machines.— [Inrolled in the Roll's Chapel Office, Aug. 1832.]

Specification drawn by Messrs. Newton and Berry.

TO ANGER MARCH PERKINS, of Harper Street, in the county of Middlesex, civil engineer, for his having invented certain improvements in the apparatus, or method of heating air in buildings, heating and evaporating fluids, and heating metals.--[Sealed 30th July, 1831.]

THIS invention appears to be an improvement upon the apparatus usually employed for warming apartments, warehouses, manufactories, and drying houses, by the circulation of hot water through pipes, from the external surfaces of which pipes the heat radiates, and warms the surrounding atmosphere of the places through which the pipes extend. These improvements are designed to increase the temperature of the water put in circulation; and the apparatus is described as applicable also, to " a variety of purposes which require the heating medium to be higher than that of boiling water."

The Patentee states, that his "improvements consist in circulating water in tubes or pipes, which are closed in all parts, allowing a sufficient space for the expansion of the water which is contained within the apparatus, by which means, the water will at all times be kept in contact with the metal, however high the degree of heat such apparatus may be submitted to, and yet at the same time there will be no danger of bursting the apparatus, in consequence of the water having sufficient space to expand.'

Plate II. fig. 1, shows a vertical section of a furnace, such as is proposed by the Patentee to be employed for his purpose; but the particular form of which is not claimed.

Fig. 2, is a horizontal section of the same. The kind of tubes which are found to answer best are those called drawn gas tubing; and the size most commonly to be em

ployed is about one inch outside diameter, that of the inner area being about five-eighths of an inch, but the Patentee does not confine himself to these dimensions.

In these figures a, a, a, is a coil of tubing, which is placed within the furnace, as shown in the figure; b, is a tube by which the water passes from the coil a, when in a heated state, and c, is the tube by which the water is returned to the coil, after having given off the heat, to effect the object to which the apparatus is applied; whether for heating the air in buildings, evaporating fluids, or heating metal, as will be more fully described.

The furnace consists of two compartments d, and e; the compartment d, is that in which the fuel is burned, and the compartment e, surrounds it, and is a sort of hot chamber, in which the coil of tubes a, is placed, and the water therein becomes heated by the fire in the compartmeut d, the smoke and heated air passing from the ignited fuel at f, into the compartment e, and thence into the chimney g.

The description of fuel preferred to be used, is coke, or stone coal, or other coal as free from bituminous matter as possible, which is put into the compartment d, at the upper part h, over which there is placed at all times a cover, to prevent any draft passing in that direction, by which means, when the fire is lighted and the fuel is filled up to the top of the compartment d, and the opening at h, is covered, the air to produce the combustion will ascend through the fire bars, and the fuel will in a short time become an ignited mass. The opening or door in the front of the furnace is for the purpose of having the fire lighted and the fuel stoked.

Figs. 3, 4, and 5, show the manner in which the joints of the apparatus are constructed, which are drawn on a larger scale for the purpose of making them more clear; fig. 3, is the section showing the manner of connecting the

tubes k, and l. The end of the tube k, is tapered off both inside and out to a sharp edge, which buts against the straight surface of the end of the tube l. On the ends of these tubes are cut screws; the one having a right hand screw, the other a left hand screw, and by means of the coupling piece m, which has a female screw cut right and left, the two ends of the tubes k, and 7, are brought together, and by this means a strong water tight joint is made. In this manner any number of tubes may be connected together, according to the purpose to which the apparatus is to be applied.

is

Figs. 4, and 5, are two views of the connexions of other parts of the apparatus, and also of the part of the apparatus which is intended for the expansion of the water; n, an upright tube, closed at the top, having a small screw hole to let out the air when the apparatus is occupied with water, but which is kept perfectly closed when the air is driven out. The tube n, is usually made of a larger size than those in which the circulation takes place, and in this tube there should be an area equal to the quantity of expansion which will take place in the water contained in the tubes through which it circulates, and it is said that "as water expands to about one twentieth without being converted into steam, I leave at least double that quantity of capacity in the tube or vessel n."

Two short tubes o, o, formed as cones at their ends, enter into the holes perforated in the tube n, and into the tubes P, and q, being the tube by which the hot water is conveyed from the coil a, after it has become heated; and the tube or pipe q, is the point where the apparatus is filled with water, and by which the height of the water is regulated. This tube q, must be placed in such a position that there shall be sufficient space above it in the vessel n, to allow for expansion.