Year: 1886

page_text: Date of Application, 11th Dec., 1886
Complete Left, 8th Sept., 1887
Complete Accepted, 1st Nov., 1887
We, CHARLES JOHN COPELAND, of Abbey Road, Engineer, and STANLEY FABER
PREST, of Abbey Road, Engineer, both of Barrow in Furness, in the County of
Lancashire, do hereby declare the nature of this invention to be as follows :—
1
In boilers which have combustion chambers interposed between the fire and the
tubes or flues, it is of advantage to supply air to such chambers in order to effect
therein more complete combustion of the hot gases. For this purpose, according to
our invention, we make some or all of the stays by which the walls of the chambers
are secured to the boiler shells, tubular, either by using tubes as stays, or by drilling
holes in stay bolts. In most cases the ordinary draught is sufficient to ensure an
inflow of air through these tubular stays, but when the draught is insufficient, we
connect the outer mouths of the tubular stays to a pipe or chamber supplied by a
pump or fan with air at a pressure somewhat above that of the atmosphere.
In cases where there are horizontal furnace flues, we provide a deflecting bridge in
the flue lying obliquely nearly across an upper spandril of the flue, and we make this
bridge hollow and admit air to it through tubular stays. The air heated within the
bridge passes thence into the combustion chamber and promotes combustion of the
gases.
D
L: 11th day of Decembar 1886
ABEL & IMRAY,
Agents for the Applicants.

page_text: We, CHARLES JOHN COPELAND of Abbey Road, Engineer, and STANLEY FABER
PREST, of Abbey Road, Engineer, both of Barrow in Furness, in the County of Lan-
cashire do hereby declare the nature of this invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the following
statement:
In boilers which have combustion chambers interposed between the fire and the
tubes or flues, it is of advantage to supply air to such chambers in order to effect
therein more complete combustion of the hot gases. For this purpose, according to
our invention, we make some or all of the stays by which the walls of the chambers
are secured to the boiler shells, tubular, either by using tubes as stays, or by drilling
holes in stay bolts. In most cases the ordinary draught is sufficient to ensure an
inflow of air through these tubular stays, but when the draught is insufficient, we
connect the outer mouths of the tubular stays to a pipe or chamber supplied by a pump
or fan with air at a pressure somewhat above that of the atmosphere.
In cases where there are horizontal furnace flues, we provide a deflecting bridge in
the flue lying obliquely nearly across an upper spandril of the flue, and we make this
bridge hollow and admit air to it through tubular stays.
The air heated within the bridge passes thence into the combustion chamber and
promotes combustion of the gases.
Fig. 1 of the accompanying drawings is an end view of a three flue cylindrical
boiler shewing a number of tubular stays arranged for supplying air by forced draught.
to the flue chambers.
Fig. 2 is a part sectional plan shewing several of the tubular stays with their
connections to the air supply pipe.
Fig. 3 shews one of the tubular stays to an enlarged scale. The stay A is, as usual
screwed externally and provided with nuts and it has a hole B through it. When
forced draught is employed, sets of these tubular stays are connected to air supply
pipes C one for each of the flue chambers E. All the pipes C may branch from one
main supply D, throttle valves F being provided in each branch C so as to regulate
the quantity of air admitted to each flue chamber E.
Fig. 4 is a transverse section and Fig. 5 a part longitudinal section of a boiler
having fixed in the flue I at the end of the fire flue a hollow deflecting bridge H to
the interior of which air is admitted through tubular stays A, this air issuing heated
at the upper and lower edges of the bridge, and promoting complete combustion of
the smoke and gases. The bridge H (which in Fig. 4 is represented as if it were in
section to shew its interior) by its oblique position serves to deflect a large portion of the

page_text: hot gases of combustion downwards, causing them to pass through the lower tubes K,
which otherwise are apt to have a comparatively small portion of the hot gases
directed through them.
Having now particularly described and ascertained the nature of our invention and
in what manner the same is to be performed, we declare that what we claim is :-
1. For supply of air to boiler flues, the use of perforated or tubular stays,
substantially as herein described.
2. In a horizontal flue, the use of an oblique hollow deflecting bridge supplied
with air through tubular stays, substantially as and for the purpose herein set
forth.
ABEL & IMRAY,
Agents for the Applicants.