IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1883

page_text: LETTERS PATENT to David Francis of Rhymney in the County of Monmouth,
Boiler Maker for an Invention of IMPROVEMENTS IN THE CONSTRUCTION OF
STEAM BOILERS
PROVISIONAL SPECIFICATION left by the said David Francis at the Office
of the Commissioners of Patents on the 14th September 1883.
DAVID FRANCIS of Rhymney in the County of Monmouth, Boiler Maker,
"IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS,"
This Invention, which is specially applicable to egg-ended boilers, consists in
fitting the boiler with two tubes extending internally from towards one end of the
boiler, where they are separately open to the furnace, to a point, towards the
opposite end of the boiler, at which they communicate with the side flues, one tube
with the flue on one side of the boiler, and the other tube with the flue opposite.
Additional heating surface is thus obtained, economy in fuel is effected, and the
position and arrangement of the tubes permit of ready access to the interior for
repairing or cleaning the boiler, while ample head room for water and steam above
the tubes is afforded.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said David Francis in the Patent Office on the 29th February 1884.
DAVID FRANCIS of Rhymney in the County of Monmouth Boiler Maker
IMPROVEMENTS IN THE CONSTRUCTION OF STEAM-BOILERS
My said invention, which is specially applicable to egg-ended boilers, consists in
fitting the boiler with two tubes extending from towards one end of the boiler, where
they are separately open to receive the heated gases and other products of the
furnace, to a point towards the opposite end of the boiler, at which they communicate
with the side flues, one tube with the flue on one side of the boiler, and the other
with the flue opposite.
Additional heating surface is thus obtained, economy in fuel is effected and the
position and arrangement of the tubes permit of ready access to the interior for
repairing or cleaning the boiler. Ample head space for water and steam above the
tubes is also afforded.
And in order that my said invention may be properly understood, I now proceed
more particularly to describe the same with reference to the accompanying sheet of
illustrative drawings and the figures and letters marked thereon.
* Fig. 1, on the accompanying sheet of drawings, represents a sectional plan of an
egg-ended boiler fitted with internal tubes A in accordance with my improved method
of construction. Fig. 2 represents a longitudinal section of the boiler, and Figs 3
and 4 represent transverse sections taken towards each end of the boiler. The
tubes A extend from above the combustion chamber D of the furnace, to which they
are open, to the opposite end of the boiler B where they communicate with the flues a
at each side of the boiler, one tube communicating with the flue at one side and the
other tube with the opposite flue, as shown.
The heated gas and other products from the furnace are, after passing along the
underside of the boiler, conducted back from the combustion chamber D through the
boiler B by the tubes A and discharged into the flues a. Thence they are withdrawn
through the chimney, as indicated by the arrows shown on the drawing.
in
Under this form of construction a larger heating area is obtained, economy
fuel is effected and the increased heat which may be developped below the boiler
enables the use of small coal or dross as fuel, the bed of the boiler being constructed
in brick.
The position and arrangement of the tubes permit ready access to the interior of
the boiler for cleaning or repairing purposes.
Having now described my said invention and the mode or manner in or under
which the same is or may be used or practically carried into effect, I claim as the
invention secured to me by the herein before in part recited Letters Patent.―
The construction of boilers with tubes extending longitudinally therein open at
one end to receive the heated products of the furnace and at the other end
communicating with the side flues, whereby the heated gases and other products
are led back from towards the chimney and reconducted thereto, substantially as
herein before described and shown on the accompanying sheet of drawings.
In witness whereof I, the said David Francis, have hereunto set my hand and
Seal this 27th day of February in the year of our Lord one thousand eight hundred
and eighty four.