IMPROVEMENTS IN GENERATING AND HEATING STEAM
Year: 1855

page_text: LETTERS PATENT to Thomas Duppa Duppa, of Longville, in the County
of Salop, for the Invention of "IMPROVEMENTS IN GENERATING AND HEATING
STEAM." A communication.
Sealed the 18th April 1856, and dated the 26th December 1855.
PROVISIONAL SPECIFICATION left by the said Thomas Duppa Duppa
at the Office of the Commissioners of Patents, with his Petition, on the
26th December 1855.
I, THOMAS DUPPA DUPPA, of Longville, in the County of Salop, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN. GENERATING AND
HEATING STEAM" to be as follows:-
This Invention consists of a peculiar combination of apparatus for generating
and heating steam. For this purpose several cylindrical upright boilers are
combined and fixed, by preference around a circle. Each boiler has its furnace
or fire-place at its lower end, the lower part of the boiler surrounding the fire.
At the upper part of the furnace or fire box a series of tubular flues rises to
the upper part of each boiler, where they communicate with a chamber which
is surrounded by the steam in the upper part of the boiler. The products
of combustion from each boiler then pass downwards at the outside of a
cylindrical or conical vessel, into which the steam from the series of boilers
is conducted after having passed into a conical vessel, which is fixed above the
one now under description; and then the products of combustion, having arrived

page_text: at the lower end of such vessel, ascend through this vessel by a flue or flues,
and then through the upper vessel above mentioned, through a flue or flues
formed through the same, into which the steam is first conducted. By such
arrangement or combination of parts the steam is generated under the most
favorable circumstances, and then highly heated.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Duppa Duppa in the Great Seal Patent Office on
the 23rd June 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
DUPPA DUPPA, of Longville, in the County of Salop, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-sixth day of December, in the year of our
Lord' One thousand eight hundred and fifty-five, in the nineteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Thomas Duppa Duppa, Her special licence that I, the said Thomas Duppa
Duppa, my executors, administrators; and assigns, or such others as 1, the
said Thomas Duppa Duppa, my executors, administrators, 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 "IMPROVEMENTS
IN GENERATING AND HEATING STEAM," (a communication,) upon the condition
(amongst, others) that I, the said Thomas Duppa Duppa, my executors or
administrators, by an instrument in writing under my, or their, or one of their
hands and seals, 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.
A
NOW KNOW YE, that I, the said Thomas Duppa Duppa, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and. ascertained in and by the following
statement thereof, that is to say:-
This Invention consists of a peculiar combination of apparatus for generating
and heating steam. For this purpose several cylindrical upright boilers are
combined and fixed, by preference around a circle. Each boiler has its furnace
or fire-place at its lower end, the lower part of the boiler surrounding the fire.

page_text: At the upper part of the furnace or fire box a series of tubular flues rises to
the upper part of each boiler, where they communicate with a chamber. which
is surrounded by the steam in the upper part of the boiler. The products
combustion from each boiler, then pass downwards at the outside of a
cylindrical or conical vessel, into which the steam from the series of boilers is.
conducted after having first passed' into a similar vessel, which is fixed above
the one now under description; 'and, then the products of combustion, having.
arrived at the lower end of such vessel, ascend through this vessel by a flue
or 'flues, and then through the upper-vessel above mentioned, through a flue or
flues formed through the same, into which the steam is first conducted. By
such arrangement or combination of parts the steam is generated under the
most favourable circumstances, and then highly heated.
The present improvements consist in the employment of boilers for marine
and other purposes; with tubes or flues-placed vertically instead of horizontally,
and in such a manner that the return of the flame and heated air; after having
passed' through the tubes; may circulate around the steam chamber; so as to
effectually dry and in a certain degree surcharge the. steam. This is effected
by forming a chamber with the boiler bodies, into which chamber the base of
the chimney descends. Around the base of the chimney is a steam reservoir,
which receives the steam from an upper and distinct reservoir disposed around
the upper portion of the 'chimney, and is intended-to-purge and: separate the
steam from the priming water.
The following: description, with 'reference to the accompanying Drawings,
will sufficiently explain the action of the improved boilers:-
Figure 1, Sheet 1, shows the disposition of the boiler bodies A, A, A, dis-
posed so as to form a closed chamber around the chimney B, B. Around the
lower part of the chimney a steam chamber C is disposed, which is subjected
to the action of the heated air and gases, as they. escape from the smoke box
of the vertical boilers, and circulate over the exterior and interior, surfaces of
the lower steam chambers C, C. Above the boilers and the steam chambers C,
and entirely separate from it, is another steam chamber D, D, whose internal
surface only is exposed to the heated air and gases. The top of the chamber
D, is put in communication with the bottom of the chamber C,, by means of
the pipé E, to which pipe E are affixed two valve chambers F, F, in which
are two valves opening towards the chamber C. G, G, shows the position of
the steam pipes by which the steam generated in the boiler body A, A, A, is
taken; and, together with the priming water and ebullition, is thrown into the
upper reservoir a short height from the bottom. II, II, are pipes from the
under side of the top reservoir, which return back into the boiler body and

page_text: plunge a considerable distance below the water level; I. is the steam pipe, which
takes the steam from the top of the lower chamber to the engine, or to perform
any other desired effect. Now it is evident that when the steam generated in
the boiler body is allowed to pass freely into the upper reservoir D, it will
rise slowly over the heated surface of the chimney to the top of the reservoir,
but in so rising slowly the priming water will either evaporate, or it will fall
by its own gravitation to the bottom of the reservoir C, and thence back into
the boiler body by means of the pipe H. The steam having arrived at the
top of the chamber C, enters freely into the pipe E, by which it descends, lifts
the valves a, a, and thence descends to the bottom of the chamber C, C; now
as the sectional area of this chamber is very great, compared to that of the
eduction steam pipe, the steam will rise slowly from the bottom between the
heated surfaces of the chamber, and when it reaches the eduction pipe I, it
will be free from water, quite dry, and highly heated. The smoke box doors
J, J, are so disposed that the tubes may be cleaned with great facility. Any
number of boilers may be disposed around the chimney, and each fluc after
leaving the smoke box may be entirely separate from the others until it reaches
the base of the chimney, so that one or more of a system of boilers may be
shut off or blown out independently of the others.
Sheet 2, Figure 2 shows the application of the same principle of action to a
single boiler body, in which all the parts are similar to those shown in Sheet 1,
Figure 1, and the action the same; but a means is provided to enter the
boiler by means of the man-hole M, and by unbolting the steam-tight joint
N, the bottoms of the tubes and the crown of the fire box can be visited,
cleaned, and repaired, and also the chimney from time to time cleaned and
repaired.
In witness whereof, I, the said Thomas Duppa Duppa, have hereunto set
my hand and seal, this Twenty-first day of June in the year of our
Lord One thousand eight hundred and fifty-six.
Witness,
JOHN HUMPHREYS,
THOMAS DUPPA DUPPA. (L.S.)
of Cheney Longville, Shrewsbury.