IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1875

page_text: COMPLETE SPECIFICATION filed by the said Cornelius Hessel at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on. the 3rd May 1875, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.-A communication from
abroad by Joseph Pregardan, of Deutz, near Cologne, Germany.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CORNELIUS
HESSEL, of 38, Great St. Helens, in the City of London, Analytical and
Consulting Chemist, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF STEAM BOILERS," and have petitioned Her Majesty to
grant unto
executors, administrators, and assigns, Her Royal
Letters Patent for the same, and have made solemn Declaration that it
has been communicated to me from abroad by Joseph Pregardan, of
Deutz, near Cologne, Germany.
NOW KNOW YE, that I, the said Cornelius Hessel, do hereby declare
that the following Complete Specification, under my hand and seal,.
fully describes and ascertains the nature of the said Invention, and in

page_text: what manner the same is to be performed, in and by the following
statement:-
This Invention relates to improvements in steam boilers known as
multitubular boilers, and consists chiefly in,—
1. A peculiar construction of the boiler.

page_text: tubes and inner plates only of the cylindrical chambers are exposed to
the fire or flame, therefore the rivets and joints are sheltered as much
as possible against the injurious effect of the fire.
The fire-grate runs parallel with the boiler tubes, as seen in Figs. 1, 2,
and 4; P, P, are the fire-doors; L, the fire-room; M, the place for the
fire-bars. The grate being narrow but long spreads the heat uniformly
across the boiler tubes. But to cause the flame to ascend and descend
as shown by the arrows in Fig. 1, a partition of firebricks Q runs
parallel with the boiler tubes above the chief pipe D; in consequence of
this the flame not merely ascends, but partly passes around the steam
reservoir and superheater by the flue ",", and descends on the other side
of the partition wall where it enters by the narrow slit Z the main
flue N. The brickwork is run up around the sides of the boiler and
superheater, and the inside lined with fire-bricks f, f, Fig. 1. The front
and rear of the boiler chambers pass through the brickwork as seen in
Figs 2, 3, and 4. The same is the case with the end plates of the super-
heater. In consequence of this arrangement the whole boiler can be
cleaned, and if requisite repaired in the shortest time as the removal of

page_text: the lids permits a full inspection and an easy access to the interior. To
provide adits for the cleaning of the flues, the slides p, p, Fig. 3, in
the front of the boiler close the respective openings left in the brickwork.
For the regulation of the draught a slit O, Fig. 4, is provided in the
main flue.
Having thus fully described the said Invention and shown how the
same may be carried out, I claim,―
1. The construction of multitubular boilers with cylindrical chambers
on both ends, essentially as described, with a removable lid in front.
2. The addition to the same of a steam reservoir and superheater, ]
essentially as set forth above.
3. The setting in brickwork of the boiler and superheater, the arrange-
ment of the fire-place and flues, mainly as described above.
In witness whereof, I, the said Cornelius Hessel, have hereunto
set my hand and seal, this Third day of May, in the year of our 1
Lord One thousand cight hundred and seventy-five.
CORNET TIIN
ITICATT