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Statement of the case.

this country for some time, was not a matter of question. But persons were not all agreed as to what was the most economical and otherwise the most advantageous mode of embodying the principle which made the distinguishing characteristic of the stoves.

The bill was founded on two letters patent; one reissued patent, granted to the complainants, February 3d, 1863, for an "improvement in stoves," the original patent having been granted to Hailes & Treadwell, as inventors, May 7th, 1861; the other a patent granted to one Mead and Hailes, assignees of Hailes & Treadwell, as inventors, August 11th, 1863, for an "improvement in coal stoves;" the interest of Mead in 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 fire-pot, and secure for the flame a free expansion in a lively and brilliant

Statement of the case.

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:

"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 a por

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tion 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

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