sideration of the existing circumstances, regulate it. The proportions we have used have varied from the twentieth part and upwards of alloy to each part of block tin. And the effect of an improved crystallisation will be produced, whether such mixture or alloy be introduced into or added to the tin, either by the mixture of the ores of the respective metals or semi-metals, or either of them, or otherwise, previous to, or in, the smelting of the block tin before coinage, or afterwards to the block, in the manner above described. In witness whereof, &c. Specification of the Patent granted to ZACHARIAH BARRATT, of 27, Windmill-street, Tottenham Court Road, in the County of Middlesex, Cabinet-maker and Carpenter; for an Invention for curing, cleansing, sweeping, and ventilating Chimnies; and when Chimnies are on fire ́ for extinguishing the same. Dated February 10, 1818. With an Engraving. To all to whom these presents shall come, &c. NOW KNOW YE, that in compliance with the said proviso, I the said Zachariah Barratt do hereby describe and ascertain the nature of my said invention, and in what manner the same is to be performed, by the plan or drawing in the margin of these presents, and the following description thereof; that is to say: I make a tube of sheet iron, tin, or copper, square at one end, to fit chimnies of different sizes, with a flanch of about two inches, more or less, to build on chimney; the other end of the tube to be round, about ten inches diameter, more or less. The tube may be about twenty inches high, more or less; to which tube I rivet about seven stand VOL. XXXIV.—SECOND SERIES. Ddards, ards, more or less, about seven inches high, made of iron or copper wire, set off about half an inch. On top of standards I rivet another tube of iron, tin, or copper, about eleven inches diameter and about twelve inches high, the distance between the two tubes being the space intended for the escape of smoke. In this tube about six inches high, I rivet three pieces or stubs of iron for a circular plate of iron, tin, or copper to lay on; in which plate I cut an oblong square hole, over which I rivet or screw a frame and pulley for cord or chain to work or act upon, in the operation of sweeping the chimney at the top of the upper tube, I fit a cover with rim to take off. In the centre of the cover I cut out a hole, about two inches and a half in diameter, for oil box to pass through, about two inches above the surface of the cover; on the under side of the cover I fix or rivet a supporter, to project down about two inches more or less, with a hole in centre to admit a screw from the bottom of oil box to pass through, with screw nut under the supporter to screw oil box tight to the supporter. In cases where chimnies do not smoke, I do not attach the curtain or external tube, nor the oil box in the cover of the inner upper tube. For the curtain or external tube for curing smoky chimnies, I make a tube of iron, copper, or tin about fourteen inches diameter, and about twentythree inches high, more or less, on the top of which I fold on a cover; in the centre of cover I rivet a strong piece of iron, with a hole in the centre of both plate and cover for spindle to pass through up to the collar, which collar is to support this tube or curtain; on the top of cover I put a piece of loose iron or copper, cast or wrought, about five inches diameter, and raised up to the centre about one inch, being the segment of a sphere with a hole in the centre the size of spindle, for the screw part part of spindle to pass through. I then attach a nut of copper or iron to spindle to screw down curtain or tube; in the bottom of tube or curtain I fold a wire inside to strengthen the same; on the top of the cover of curtain or tube I rivet a piece of iron, tin, or copper, plain or ornamented, about ten inches by nine, more or less, to project beyond the tube or curtain about five inches, more or less, to act as a vane. I cut two apertures in front of tube or curtain about ten inches wide and seven inches high, more or less; I leave a part or portion about three inches wide to strengthen the tube or curtain between the apertures, which apertures are for the escape of the smoke from the inner tubes. The oil box may be made of wrought or cast metal, about four inches long, and two inches and a half in diameter. The bolt which fastens oil box to supporters I make with a square head, capped with steel and tempered, about an inch square and three-eighths of an inch thick, with a centre for spindle to work on; the shank of which bolt goes through the bottom of oil box with a leather collar and white lead to prevent leakage; the spindle I make about three inches and a half long, the centre capped with steel and tempered, under a collar projecting about five-eighths of an inch, which collar is to support the external tube or curtain; above the collar I continue the spindle about two inches, which should be screwed down to collar with a copper or iron nut to secure the external tube or curtain from lifting off. In the inside of oil box I leave projecting cheeks or grooves sides and bottom, to support a piece of brass with a hole through the centre for spindle to work or act in the same. I then drill one hole through each side of the oil box into the brass, into which I put a piece of iron or copper wire to fit tight. I also drill a hole in spindle directly under the brass, in which I put a key of wire, which prevents the spindle or brass lifting out of oil box; on the top of oil box I put a cover of leather to prevent soot or dirt getting to the oil; on the top surface of the brush I have contrived a plate of iron or copper, which I raise to the centre about one inch, being the segment of a sphere to prevent lodgment of water or lamps, and as hereafter more particularly explained. In which plate I make two holes, to correspond with pulley in upper part of upper tube, one hole in the centre, and another hole about one inch and three quarters distance from the centre bole, which holes should be according to the size of cord or chain that may be used in the operation of sweeping. The plate is to lay in the upper tube above the brush, and as the brush is drawn down into the chimney the plate follows on top of brush until the brush enters the bottom tube; then the plate remains on the top of bottom tube, and partially closes the vent, which, in cases of chimuies taking fire, will, with this, and the advantage of working the brush down the chimney, effectually extinguish, and bring the soot down. The plate will likewise shut up the top of bottom tube, that when there is no fire in the grate, or the flue not in ́use, it will prevent condensed air or damps from entering the flue. When the brush is worked up, the plate ascends into upper tube on the top of brush. I sometimes fix three or four pieces of wire into the upper tube, and to outside of bottom tube, for the steadying of the condensing plate in descending and ascending. In which plate I make, corresponding holes, for the wire to pass through. I make a stock for brush, of wood, about four inches and a half diameter, and about the same in height, with the edges rounded off, leaving a surface of about three inches diameter on top and bottom. I reduce the middle part of the stock to about three inches in diame ter |