and pushing screws DD, to which are connected the bar E, which stands at right angles to the plate A. This bar is moved backwards and forwards by means of the screws DD, the bar E resting at the same time upon the plate A. Against the bar E the end of the stage of the table B in Fig. 4 strikes, and it is the discretionary use of this guide or stop, as heretofore expressed, that entirely regulates the degree of contact which is proper for the table to receive for the various sorts of leather that may be required to be glazed, grained, and finished. When the stop is thus properly adjusted to any particular kind of leather, the screws D D are locked by the counter nuts F F, which prevent any alteration of the stop or bar, which determines the degree of contact the table is to have at any time with the glazing-rollers.

Although, as we have before expressed, that one machine is adequate to all the purposes of graining, glazing, and finishing any description of leather by the changing the rollers as heretofore described to answer the two operations of rolling on and rolling off with; but as we have before expressed it as our opinion, that a table of brass is better adapted for the rolling on with, from the circumstance of the leather being necessary to be damper for that operation than for the other, which might be liable to damage or discolour the leather was this operation performed on an iron table, by its being liable to rust we therefore recommend, to prevent this probable inconvenience, and to save the certain and repeated trouble of changing and adjusting the rollers, to use what we denominate a double machine; a single one of which is represented in the perspective Fig. 1.

It may be farther necessary to observe, that a platform is required for the operator to stand upon, to en

able

able him to have a proper command of the back of the table, where he stands immediately in front of the revolving roller-shaft, and which enables him to move the treadle with his foot, which brings up and keeps the table to its work; and which also furnishes him with a complete view of the leather while it is operated upon, which he in an instant can with the utmost ease disengage, and with a corresponding facility again bring up the table to its work, while the roller-shaft is revolving at any rate of velocity. In witness whereof, &c.

Specification of the Patent granted to JAMES CAPARN, of Leicester, in the County of Leicester, Brazier; for a Machine for discharging Smoke from smoking Chimnies. Dated October 30, 1806.

With Engravings.

To all to whom these presents shall come, &c. NOW KNOW YE, that in compliance with the said proviso, I the said James Caparn do hereby declare that my said invention is described in the drawings delineated in the margin of these presents, and by the description thereof hereinafter particularly set forth; that is to say: This machine, which I denominate Caparn's Smoke Disperser, and have invented for the prevention and cure of smoky chimnies, is to be placed on the top of the chimney over the vent or orifice, and secured thereto by brick-work, or by any other method which may be deemed expedient. The funnel of the chimney should be cleared from all contractions or other obstructions which might impede the smoke in its passage into the body of the machine. The current through the chimney gives a rotary horizontal motion to the flyers or vans at the top of

the

the machine, which thereby disperse the smoke and prevent the action of the atmosphere from returning it into the funnel of the chimney. The machine and its several parts are represented in the drawings delineated in the margin of these presents.

No. 1 (Figs. 1. Pl. VII.) represents the internal structure of the body of the machine. No. 2 and 2 are bars crossing each other, riveted to the sides, and supporting the upright spindle No. 4, which is incircled by the hollow barrel or cylinder No. 3, which is open at the upper end, and screwed at the bottom to the base, from which the spindle No. 4 arises, and is intended to contain oil for facilitating the motion of the vans or flyers. This barrel must be made large enough to admit the hollow cylinder No. 6, which contains a female centre to run or turn on the spindle No. 4. The figure No. 5 represents the cap or top of the machine, and consists of a set of vans or flyers, fastened at their upper extremities to the upper end of the cylinder No. 6, and riveted at the bottom to a circular rim of metal. No. 7 represents the external appearance of the whole machine when put together and complete for use; the size of which must be in proportion to the tunnel of the chimney whereon it is to be placed. The body or external case of the machine, and also the vans or flyers, and the rim to which the same are rivetted, may be made of iron, copper, or tin. The cross bars may be made of iron, and the spindle of steel, or iron faced with steel, hardened at the point working in the female centre. The female centre may also be made of steel, or iron faced with steel, hardened at the part receiving the spindle: and the two cylinders may be made of iron, cast-iron, copper, or tin. In witness whereof, &c.

Specification

Specification of the Patent granted to JOHN DICKSON, of Edward-street, in the Parish of Christchurch, in the County of Surrey, Engineer; for an improved Method of constructing Cocks for stopping Fluids; and which Cocks, by one Motion or Operation, will permit such Fluids to pass in different Directions.

Dated March 29, 1808.

With Engravings.

To all to whom these presents shall come, &c. NOW KNOW YE, that, in compliance with the said proviso, I the said John Dickson do hereby declare, that the nature of my said invention, and the manner in which the same is to be made and performed, are hereinafter particularly described and ascertained; that is to say: Fig. 2 (Plate VII.) in the annexed plan is an apparatus or cock constructed so as to answer all the purposes of the common place sluice and stop cocks for permitting fluids to pass and re-pass as may be requisite, and by one operation to answer the purpose of two separate cocks or valves; and which apparatus I claim as my invention.

Fig. 2, A, is a plate or piece with two apertures C and D, of any given dimensions, for permitting fluids to pass and re-pass from or to the pipe F, as may be required. These apertures are of an oblong form, which I consider the best, although they may be made of any other form. This plate or piece A, and the other parts of the apparatus, may be made of brass, iron, or any other metal or materials which may be found to agree best with the nature of the fluids acting thereon, or the purpose for which the apparatus may be wanted. The

surface of the plate or piece A is made sufficiently even and smooth on those parts which surround the apertures, so as to be perfectly air and steam tight when the surface of the moveable plate or piece B (which is to be equally even and smooth) comes in contact with it. The moveable plate or piece B has a curve or space made or cut in the surface of it so as to be sufficiently wide to cover both the apertures C or D and the intermediate space in the face of the plate A, so that fluids may pass from or into the apertures C and D at the same time by moving the plate or piece B in a direction parallel with its surface. By a similar motion the communication between C and D may be shut, and a communication opened at pleasure between C or D alternately and the pipe F, which pipe contains the fluid to be conveyed into, or which passes through, the apertures C and D alternately, as may be required. G is the rod by which the plate or piece B is moved. I is the stuffing-box through which the rod G passes. H is a spring pressing against the rod G, for the purpose of keeping the plate or piece B in close contact with the surface of the plate or piece A. It is also a guide for the rod.

Fig. 2 represents the said apparatus applied to a double acting steam-engine, the application of which apparatus to steam-engines I claim as my invention. Fig. 2 represents an open section of a double acting steamengine, with the patent apparatus or cocks applied thereto.

Fig. 3 is a front view of ditto.

In witness whereof, &c.

Specification