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Statement of the case.

which patent had become vested in the complainant Treadwell.

The specification of the reissue of February 3d, 1863, said:

"Our experience in this class of stoves" (base-burning or reservoir stoves) "is, that the most beneficial effects are to be secured from an organization which does not pass the products of combustion up, around, and over the top of the coal-supply reservoir, so as to heat a surrounding jacket thereof, but heats a circulating or ascending body of air by means of radiated heat from the fire-pot, and at the same time heats the base of the stove by means of direct heat, circulating through descending flues which lead into the ash-pit, or around it, and to the smoke and draft flue; also, that the greatest economy, considering the increased benefit secured from supplying coal continuously out of a reservoir, is attained with an arrangement which holds the superincumbent body of coal in suspension, such arrangement being a reservoir with a contracted discharge extending slightly down into a flaring or enlarged fire-pot, around or above the whole upper edge of which, outside of the contracted discharge of the coal-supply reservoir, the flame is allowed to circulate, and, therefore, caused to descend and circulate around or under the base portion of the stove, in its passage to the smoke and draft flue.

"The effect of the first-named plan is to husband the radiated heat and use it for the purpose of warming the upper part of the stove and the room in which it is situated, as well as for heating air for warming rooms above, if desirable, and at the same time to so confine the direct fire-heat and keep it in contact with the base portion of the stove a sufficient length of time as to insure the warming of the same to a comfortable degree.

"The effect of the second plan is to relieve the incandescent coal from the weight of the body of superincumbent coal, and thus obviate a compression of the incandescent coal in the firepot, and secure for the flame a free expansion in a lively and brilliant manner, and thus enable it to act with great heating effect upon the lower portion of the stove in its passage to the smoke and draft flue.

"With the view of organizing a stove or heater which operates on the base-burning or coal-supply reservoir principle, and at the same time embraces the two plans of operation above referred to, we have devised the following plan of construction:

Statement of the case.

"A is a base of our stove, constructed with a chamber B, which extends around and beneath the top plate of the said base. In this chamber air may be admitted through the front passage A. Upon the top-plate of the base A is erected a support C, for horizontal grate D, and a fire-pot E, as shown. The support forms a chamber below the grate, and out of the front of the support

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a portion of metal is removed as at b, so that air to the fire on the grate may have free access when the ordinary regulator or damper is open. In order to insure the passage of the air to the fire only from below the grate, a cut-off, c, extends out from the upper front part of the support C, and rests upon the two lateral stops d, which extend out from the front of the support, as shown. The top plate of the base, at points outside of the sup-. port C, is perforated with three apertures, F, F1, F2, which com

Statement of the case.

municate with the chamber B. The apertures F1, F3, have vertical pipes F, F, placed in or around them, while the aperture F has the draft and smoke pipe or flue Fs placed in or around it, as shown. The pipes F, F, extend up to the upper rim of the fire-pot E, and connect to perforated flanges or cars of said pot, so that a space, f, exists between the pipes and fire-pot, as shown. The outer portion of the top edge of the pipes F3, F, protrudes above the flanges to a slight degree, as indicated at g, g. "The fire pot flares at top and contracts at its bottom; the flare and contraction are gradual. The section of the metal, of which the pot is made, shows a gradual decrease in thickness from the centre of the depth of the pot in an up and downward direction, as indicated at 1, 2, 3. This construction or form of the metal insures an equable heating of the pot at all parts, and a uniform expansion and contraction by the principle of conduction, the thickest and most intensely heated portion imparting to the thinnest or less intensely heated portions a large amount of its heat, on the principle just mentioned.

"Above the fire pot and vertical pipes the coal-supply reservoir G is arranged. The reservoir is constructed with a flange, h, at its base, said flange turning down at its outer edge so as to form a right angle, or thereabouts, as shown at i. The rim, i, of the flange fits down upon the rim of the fire pot and incloses the top opening of the fire-pot of the vertical pipes within a continuous chamber J, as represented; the, said chamber constituting an enlargement to the upper portion of the fire-pot, as it were, and thus giving increased room for the expansion of the flame.

"The diameter of the coal reservoir is decreased below the point where the body of supply coal is suspended by means of an extension or ring-flange, k, which is in form of an inverted - frustum of a cone. This flange also serves, in connection with a detachable ring v, which, also, is in form of an inverted frustum of a cone, to form a frame or sash for the reception of firebrick or other fire-proof material, as shown at m. The ring v has a horizontal flange, and bolts by the same, to the under side of the flange n of the coal-supply reservoir. The fire-brick are shaped so as to form, when put together, an inverted frustum of a cone, and they, therefore, when clamped between the devices k, v, cannot descend, separately, out of their places, nor can they do so unitedly, as the largest circumference of the conic frustum m cannot pass through the space between the lower

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