IMPROVE- MENTS IN STEAM-ENGINE BOILERS
Year: 1853

page_text: LETTERS PATENT to Thomas Charles Medwin, of the firm of
Messrs. Medwin and Hall, of the Blackfriars Road, in the
County of Surrey, Engineers, for the Invention of "IMPROVE-
MENTS IN STEAM-ENGINE BOILERS."
PROVISIONAL SPECIFICATION left by the said Thomas Charles
Medwin at the Office of the Commissioners of Patents, with his
Petition, on the 23rd August 1858.
I, THOMAS CHARLES MEDWIN, of the firm of Messrs. Medwin and Hall,
of the Blackfriars Road, in the County of Middlesex, Engineers, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
STEAM-ENGINE BOILERS" to be as follows:-
This Invention has for its object two improvements in steam engine
boilers: the first consists of applying a coiled tube within the fire tube
or fluc passing thro' a steam boiler, one end of such coiled tube being
connected with the boiler, and the other end connected to the feed
pump, and also having a cock by which the coiled tube may be blown

page_text: its flues a, b, shown in the Drawing, with the exception of the parts
hereafter described, is similar to steam boilers heretofore made; and
I would also state that the shape of the boiler and the arrangement of
-the flues may be varied, and yet have my improvements applied
-thereto. c, c, are coiled tubes, one in each flue; one end of each of the
tubes c, opens into the boiler, and the other ends are connected
together, and to the supply pipe d, leading to the pump; and there are
cocks c, e, applied to such pipes to allow of part of the water in the
boiler being blown through the pipes c, c. By the application of the
pipes c, c, in this manner within the flues of a steam boiler, the water
entering or fed into the boiler will be heated in its passage from the
feed pump to the boiler. The form of the tubes c, c, may be varied,
and it should be understood that I do not claim the heating of the
water supplied to a steam boiler; this part of my Invention consists of
the application of tubes into the flucs of steam boilers, as above
explained. It will be seen that the upper part of the boiler is formed
with two recesses, the one to receive the cylinder, and the other to
admit of the rotation of the crank. The cylinder may thus be let into
the boiler, and by its having suitable flanches and brackets, as at d', d³,
may be fixed thereto, as is shown. Any desirable degree of concavity
may be made in the boiler to receive the cylinder of the engine, but
I prefer that the hollow should not exceed one half the diameter of the
cylinders. And it will be evident that where an engine is to consist
of two cylinders a suitable recess may be made to receive the two
cylinders. e', is one of the two side framings and guides for guiding
the end of the piston rod; this frame is fixed to the cover of the
engine, also to the boiler, and to the bearings f, of the main shaft, such
bearings f, being affixed to the boiler on either side of the recess g,
made in the boiler where the crank rotates.
Having thus described the nature of my Invention, and the manner
of performing the same, I would have it understood that I make no
claim to any of the parts separately, nor do I confine myself to the
precise details. But what I claim is, first, the application of tubes c,
in the flues of steam boilers; and, secondly, I claim constructing steam

page_text: boilers with recesses for receiving the engines and for admitting the
rotation of the cranks, as herein described.
In witness whereof, I, the said Thomas Charles Medwin, have
hereunto set my hand and seal, this Seventeenth day of
February, in the year of our Lord One thousand eight hundred
and fifty-four.
Witness,
WILLIAM TONGUE.
THO CHA. MEDWIN. (t.s.)