Year: 1886

page_text: I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention (a communication from
Thomas Clifford of the town of Mount-Savage in the County of Allegany, and
State of Maryland, in the United States of America), and in what manner the
same.is to be performed, to be particularly described and ascertained in and by the
following statement:—
The invention consists in certain novel parts and combinations of parts, in con-
nection with a steam boiler and its smoke-box, whereby the heat contained in the
escaping volatile products of combustion is effectively utilized in heating water,
preparatory to the discharge of the same into the boiler.
In the drawings-
Figure 1 is partly a perspective and partly a transverse sectional view of a
locomotive-engine boiler in which these improvements are applied.
Figure 2 is a longitudinal central section, on the line xx, in Figure 1.
Within the shell A' of the smoke-box A, are fitted the annular heads a and a³,
the head a encircling the prolongation e, of the boiler E, and the head a¹ abutting
against the ring D.
Concentric with the shell A¹, is the inner cylinder A², which is provided with
the annular head a³ which closes the space between the body of the cylinder and
the exterior face of the prolongation e, of the boiler, and which is provided also
with the interior annular flange a³, which is joined at its outer periphery to the
cylinder, and at its inner edge to the rear face of the ring D. The head a² is
provided with a series of tapped openings to receive the inner threaded end 6 of
the water tubes B, the opposite extremities of such tubes being received within a
corresponding series of openings formed in the head or flange a³.
The head or outer plate A³, of the smoke box, is provided with tapped openings
for the insertion or removal of the water-tubes B, and for the insertion of a flue-
cleaner, when it becomes necessary to remove accumulations of sedimentary matter,

page_text: such openings being normally closed by screw nuts a. A ring J, at the base k,
of the smoke-stack K, and between such base and the cylinder A, constitutes
an extension downward of the smokestack, and completes the jacket or water-
heater L.
At a suitable point near the base of the jacket or water-chamber L, a cold water
induction pipe G, is introduced, the inflow through such pipe being controlled by
a check-valve g. Water being supplied by means of this pipe G, circulates rapidly
through the water tubes B, and through the flange-like pockets 1, and , of the
water-chamber or jacket L; and being quickly heated by the escaping products of
combustion which, entering from the boiler-flues, thoroughly envelope the water-
tubes, and the interior surface of the water-jacket, is discharged at the top of the
water jacket through the hot water pipe H, into the interior of the boiler E, such
discharge being regulated by the check-valve h.
In some cases it may be desirable not to extend the jacket entirely across the
bottom of the smoke-box that portion of the same being much less highly heated
than the upper and side portion. I prefer however, the construction which I have
shown and described, as presenting an effective means for utilizing the waste heat
of the products of combustion.
]
Having now particularly described and ascertained the nature of the said
invention as communicated to me by my foreign correspondent and in what
manner the same is to be performed I declare that what I claim is
1. The combination with a smoke-box, of an encircling water-jacket, provided
with inwardly-extending pockets, and with longitudinal water-tubes, extending
through the smoke-space, and connecting the inwardly extending pockets; sub-
stantially as and for the purposes described.
2. A smoke-box which is provided with an exterior longitudinal water-chamber
which encircles the sides and partially encloses the ends of such smoke-box, and
which has longitudinal water-tubes which extend across the path of the escaping
products of combustion, and which connect the oppositely-placed enclosing end
portions of the water-chamber.
3. The combination with a smoke-box, of an encircling water-chamber which has
inwardly-extending oppositely-placed end portions, and water tubes which connect
such end portions and an end-plate or head which is provided with orifices which
are coincident with the water-tubes, and with screw-nuts for closing such orifices.
Dated this 23rd day of August 1886.