IMPROVEMENTS IN STEAM BOILERS
Year: 1871

page_text: LETTERS PATENT to Robert Brough, of No. 13, Norfolk Street,.
Sunderland, and Charles Mace, of Lambton Office, Sunderland, both
in the County of Durham, for the Invention of "IMPROVEMENTS IN
STEAM BOILERS."
COMPLETE SPECIFICATION filed by the said Robert Brough and
Charles Mace at the Office of the Commissioners of Patents, with
their Petition and Declaration, on the 10th March 1871, pursuant
to the 9th Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ROBERT
BROUGH, of No. 13, Norfolk Street, Sunderland, and CHARLES MACE,
of Lambton Office, Sunderland, both in the County of Durham, send
greeting.
WHEREAS we are in possession of an Invention for "IMPROVEMENTS
▸ IN STEAM BOILERS," and have petitioned Her most Excellent Majesty Queen
Victoria to grant unto us, our executors, administrators, and assigns, Her
Royal Letters Patent for the same, and have made solemn Declaration
that we are the first and true Inventors thereof.

page_text: NOW KNOW YE, that we, the said Robert Brough and Charles
Mace, do hereby declare the nature of the said Invention to be as
follows:-
This Invention has for its object improvements in steam boilers. For
this purpose we construct a steam boiler of two or more sections, each
fitted with horizontal fire-tubes and placed at a sufficient distance apart
from one another for fire-grates to be placed between them, the several
sections are also connected to one another at top and bottom by tubes,
and thus they are combined or connected together so as to act as one
large boiler. Above each fire-grate is placed an arch of fire-brick. The
products of combustion from the fires in the fire-grates pass through
the horizontal tubes which are below the arches into a smoke box on the
exterior of each of these sections, and from these smoke boxes they pass
back through the horizontal tubes which are above the arches into a
central smoke box provided with a chimney outlet. By thus making
up a boiler of two or more sections, each complete in itself, having a
separate shell, and fitted with fire-tubes passing horizontally through
it, not only can a boiler be made at less cost than heretofore, but the
boiler will also be more durable and require less repair than boilers now
in use.
In the Drawings hereunto annexed we have shewn two examples
of boilers constructed as above described.
Figure 1 of the Drawings is a front view, partly in section, of a boiler
composed of four outer sections, and a fifth section placed centrally
between them; a boiler so constructed is especially applicable as a marine
boiler. Figure 2 is a vertical half section of the same boiler taken at the
line C, D, in Figure 4; Figure 3 is a horizontal half section taken at
the line A, B, in Figure 1; Figure 4 is a plan view of half of the boiler..
In these Figures A, A, are four vertical sections stayed horizontally
in both directions by tubes at right angles to one another, these sections
are connected together at top and bottom by tubes a, a, the tubes at the
top serve to connect the steam spaces, and at the bottom to connect the
water spaces; B is a central section connected to the outer sections at top
and bottom by pipes b, b, it has within it an inner circulating tube C
for ensuring a proper circulation of the water within the boiler; D, D, are
the fire-grates between the sections A, A; E, E, are the arches above
the fire-grates; and F, F, are chambers on the exterior of the
sections A, A. Each side of these is fitted with doors lined with fire-

page_text: brick, by opening these doors any of the tubes of the boiler can be got at
and cleaned. The arrows shewn in Figure 2 indicate the direction taken
by the products of combustion from the fires on the fire-grates as they
pass into and out of the chanıbers F, and into the central smoke box G;
H, H, are rows of pipes attached to the socket pieces a, a, and closing
the furnace fronts, the furnace fronts might however be closed by brick-
work if desired.
On Sheet 2 of the Drawings annexed is shewn a boiler similarly made
up of two sections, only each section being complete in itself and having
fire-tubes passing through it horizontally, as in the boiler above described,
except that the fire-tubes pass through the sections in one direction
only. The general construction of the boiler is clearly shewn by the
Drawing, so that it is unnecessary to give any further description of it.
Having thus described the nature of our Invention and the manner
of performing the same, we would have it understood that what we
claim is,―
1. The constructing steam boilers of two or more sections set suffi-
ciently far apart to form spaces between them for fire-grates, and each
complete in itself and fitted with internal firc-tubes through which the
products of combustion are conducted to and fro, substantially as herein
described.
2. The general combination or arrangement of steam boilers sub-
stantially as herein described and shewn on Sheet 1 of the Drawings
annexed.
3. The general combination or arrangement of steam boilers, sub-
stantially as herein described and shewn on Sheet 2 of the Drawings
annexed.
.
In witness whereof, we, the said Robert Brough and Charles Mace,
have hereunto set our hands and seals, this Eight day of March,
in the year of our Lord One thousand eight hundred and seventy-
0120
ROBERT BROUGH. (L.S.)
CHARLES MACE. (L.S.)