BOI tained a Patent for " a new me- thod of applying lire for the pur- pose of heating boilers and other vessels, where heat is required." But as the Patentee had not given a clear specification, from which an ordinary tradesman could have constructed a furnace on his prin- ciples, without any farther ex- planation, his Patent was declared void, after a trial before Lord El- do^ and a special jury, on the 3d of November last, and has conse- quently become public property. These proceedings, however, have been attended with a good effect, as the obscure account published by Mr. Ro wktree, has been more clearly denned by the evidence given in Court, especially by that of Mr. Hixdmarsh. We shall, therefore, present our readers with the specification communicated by the Patentee, and accompany it with the necessary illustrations. — The following is a literal abstract of the inventor's description : — " For heating of coppers, boilers, furnaces, ovens, and stoves, my iire-place is much smaller than heretofore made use of for the same sized copper, boiler, fur- nace, oven, or stove. Instead of placing my fire-place, according to the common practice, immediately under the boiler, or other vessel, I place it at the front, side, or end, as I see most convenient, in such a manner as to oblige the flame to rise in the front, side or end, and pass all round the vessel, &:c. while at the same time it strikes the bot- tom of the vessel, &c. without suf- fering the flame to pass off in a flue, or flues, as it usually does in the common way, and by that means sending the heat into the hues, instead of its being ased jvhere it ought to be, namely, on a O I [3°; the vessels, &c; this, any method effectually prevents ; for, by means of a small perpendicular, or other opening, into a box or trap, which I call a reservoir, and which I place horizontally, or diagonally, as the situation may require, and is made of iron, brick, stone, or any other material capable of bear- ing heat, where a valve is placed riding on centres or otherwise, and standing in a diagonal or other di- rection, as is found most conveni- ent, die flame is returned or im- peded in its progress to the chiin- ney, and made to descend below the bottom of the vessel, and pass out at the bottom, top, or side of said box, trap, or reservoir, into the jjomraon chimney. This re- servoir is placed between the ves- sel, &c. and the chimney. To the inge, which admits the flame} into the reservoir, are affixed, when necessary, sliders, registers, or stops, which serve to increase or diminish the heat. The valve in the reservoir is for the same pur- pose in another degree, which more immediately appertains to in- creasing or diminishing the draught, which it does by moving the said valve into different positions, as the speed of the operation may re- quire." It would be needless to state the particulars of the evidence relative to the effect produced by the new invented furnaces, in heating boilers, Sec. as well as the great saving of fuel, which was proved to be more than one-third, and in some ca^es nearly one-half, of what is usually consumed in furnaces constructed on the old plan. Hence we shall communicate only the substance of Mr. Hindmarsh's evidence, which greatly tends to illustrate the principles of the in- vention,.
