AN IMPROVED MODE OF CONSTRUCTING MARINE BOILERS
Year: 1853

page_text: LETTERS PATENT to James Bristow, of Bouverie Street, in the
City of London, Miller, and Henry Attwood, of Holland Street,
Blackfriars Road, in the County of Surrey, Engineer, for the
Invention of "AN IMPROVED MODE OF CONSTRUCTING MARINE
BOILERS."
Sealed the 25th April 1854, and dated the 16th November 1853.
PROVISIONAL SPECIFICATION left by the said James Bristow and
Henry Attwood at the Office of the Commissioners of Patents,
with their Petition, on the 16th November 1853.
We, JAMES BRISTOW and HENRY ATTWOOD, do hereby declare the
nature of the said Invention for "AN IMPROVED MODE OF CONSTRUCTING
MARINE BOILERS" to be as follows:-
This Invention relates to certain means of bringing the adjacent
fire-places of marine boilers into communication with each other, so
that the smoke generated in one fire-place after each successive supply
of coals may be turned on to the bright fire in an adjoining fire-place,
and be there consumed. To this end we connect the fire-places
together by side flues, formed of tubes, or otherwise, which tubes pass
through the intervening water space, and thus at all times a com-

page_text: munication is open between the several fire-places of the group.
For each fire-place a damper is provided near that end of the flues
which connects with the funnel, for the purpose of stopping the progress
of the gases of combustion when smoke is combined therewith, and
turning the smoke on to the adjoining bright fire. When, therefore, a
fire is about to give off' smoke its damper is let down, and the smoke
generated then passes through the lateral flues into the adjoining fire-
place or fire-places, but as soon as the smoke ceases to be given off the
damper is raised and the gases of combustion return to their proper
channel
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Bristow and Henry Attwood in the Great
Seal Patent Office on the 16th May 1854.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we,
JAMES BRISTOW, of Bouverie Street, in the City of London, Miller, and
HENRY ATTWOOD, of Holland Street, Blackfriars Road, in the County
of Surrey, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of November, in the
year of our Lord One thousand eight hundred and fifty-three, in the
seventeenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said James Bristow and Henry Attwood,
Her special license, that we, the said James Bristow and Henry
Attwood, our executors, administrators, and assigns, or such others as
we, the said James Bristow and Henry Attwood, our executors, admi-
nistrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "AN IMPROVED MODE OF
CONSTRUCTING MARINE BOLLERS," upon the condition (amongst others)
that we, the said James Bristow and Henry Attwood, by an instrument
in writing under our hands and seals, or under the hand and seal of

page_text: one of us, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Henry Attwood (on behalf of
myself and of the said James Bristow), do hereby declare the nature
of our said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following
statement, reference being had to the Drawing hereunto annexed, and
to the letters and figures marked thercon (that is to say):
This Invention relates to certain means of bringing the adjacent fire-
places of marine boilers into communication with each other, for the
purpose of turning the smoke which is generated in one fire-place after
each successive supply of coals on to the bright fire in an adjoining
fire-place, and thereby effecting the consumption of the smoke.
To
this end we connect the fire-places together by means of lateral flues,
which pass through the intervening water space near the fire doors,
and thus at all times a communication is open between the several
fire-places of the group. For each fire-place a damper is provided
near that end of the flues which connects with the funnel, for the pur-
pose of stopping the progress of the gases of combustion when smoke is
combined therewith, and turning the smoke into the adjoining furnace.
In the accompanying Drawing Fig. 1 represents in sectional eleva-
tion a marine boiler (having a range of three fire-places) with our im-
provement applied thereto; and Fig. 2, is a vertical section taken at
the line 1, 2, of Fig. 1. a, a, a, are the fire-places, and b, b, are the flues
for conducting off the gases of combustion and discharging them into
the funnel c. At the front part of the boiler, where the flues of the
several fire-places converge, dampers d are placed, for the purpose of
temporarily cutting off communication at stated periods between the
several fire-places and the funnel.
The fire-places a, are connected together by means of lateral flues e, e,
which are formed by passing tubes through the water space f, of the
boiler at a line a little above the highest level of the fuel and near the

page_text: front of the fire-place. These tubes we construct of boiler plate iron,
and we secure them in place in any well known manner, according to
the form of tubes which it may be preferred to employ. In firing the
boiler it will be the business of the stoker, just prior to throwing on a
fresh charge of coal, to close the damper of the fire-place which is to be
charged, and the smoke generated will then pass off by the lateral flue
into the adjoining fire-place (as shewn in the Drawing), and be there
consumed. When the smoke ceases to be given off the damper is to
be raised and the gases of combustion will then return to their proper
channel. It will be understood that the like operation must be repeated
for the several fire-places consecutively, and by this means the escape
of smoke from the funnel c, (after the fires have been once fairly
lighted) will be prevented, and consequently a great saving in fuel will
be effected.
Having now explained the nature and object of our Invention of an
improved mode of constructing marine boilers, and set forth an efficient
plan for carrying the same into effect, we wish it to be understood that
under the above in part recited Letters Patent we claim connecting the
fire-places of marine boilers together by means of lateral flues passing
through the water space, for the purpose of conducting the smoke from
one fire-place on to the bright fire of an adjoining fire-place, and thereby
effecting the combustion of the smoke.
In witness whereof, I, the said Henry Attwood, have hereunto
set my hand and seal, the Sixteenth day of May, in the year of
our Lord One thousand eight hundred and fifty-four.
Witness,
J. W. MOFFATT,
66, Chancery Lane.
HENRY ATTWOOD. (L.S.)