IMPROVEMENTS IN APPARATUS APPLICABLE TO THE SUPERHEATING OF STEAM
Year: 1861

page_text: LETTERS PATENT to William Loader Allchin and William Allchin, of the
Globe Works, Northampton, in the County of Northampton, Engineers,
for the Invention of "IMPROVEMENTS IN APPARATUS APPLICABLE TO THE
SUPERHEATING OF STEAM."
Sealed the 23rd June 1862, and dated the 21st December 1861..
PROVISIONAL SPECIFICATION left by the said William Loader Allchin
: and William Allchin at the Office of the Commissioners of Patents, with
their Petition, on the 21st December 1861.
We, WILLIAM LOADER ALLCHIN and WILLIAM ALLCHIN, of the Globe
Works, Northampton, in the County of Northampton, Engineers, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN APPARATUS
APPLICABLE TO THE SUPERHEATING OF STEAM," to be as follows:-
For locomotive or portable boilers we construct a series of tubes in a syphon
or approximatively syphon form, placed within the smoke-box and above the
flue tubes of steam boilers, this apparatus to be connected to the steam space
of the boiler, and also to a pipe through which the superheated steam. is con-
veyed to the cylinders of the steam engine. We also construct a double
chamber or box of a D form, with an outer and an inner casing, leaving
sufficient space for the steam between, and thus secure the action of the
heated gases in the smoke-box of boiler, and this box or chamber is connected
to the steam space of the boiler and to the cylinders of the engine. In con-
structing stationary boilers, we connect a series of tubes of convenient length

page_text: in a syphon or approximatively syphon form, placed within the flues or flue
tubes of boiler. We also connect one or more ends of these tubes to the
steam space of boiler, and to a pipe or pipes conveying the superheated steam
to the cylinders of the engines. We also construct a tube or tubes one within
the other, the heated gases passing through the inner tube and around the
external portion of the outer tube or tubes, the space between being occupied
by the steam to be superheated. We connect these tubes or pipes together at
each alternate end, or otherwise, or they may be all connected together at one
end to a pipe or pipes from the steam space of boiler, the other end or ends
being connected to the steam pipe or pipes, so as to convey the superheated
steam to the cylinders of engine. For marine engines it will only be necessary
to modify the details of the above arrangements according to the form of
the boiler.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Loader Allchin and William Allchin in the Great
Seal Patent Office on the 21st June 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
LOADER ALLCHIN and WILLIAM ALLCHIN, of the Globe Works, Northampton,
in the County of Northampton, Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of December, in the year of our Lord
One thousand eight hundred and sixty-one, in the twenty-fifth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the said
William Loader Allchin and William Allchin, Her special licence that we, the
said William Loader Allchin and William Allchin, our executors, administrators,
and assigns, or such others as we, the said William Loader Allchin and William
Allchin, our 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
APPARATUS APPLICABLE TO THE SUPERHEATING OF STEAM," upon the condition
(amongst others) that we, the said William Loader Allchin and William
Allchin, our executors or administrators, by an instrument in writing under
our, 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

page_text: 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 we, the said William Loader Allchin and William
Allchin, do hereby declare the nature of the said Invention, and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The nature of our said Invention, as we heretofore (in words or in effect)
described the same in and by the Provisional Specification left and recorded
on application for the said Letters Patent, consists in the following arrange-
ment: For locomotive or portable boilers we construct a series of tubes in
a syphon or approximatively syphon form, placed within the smoke-box and
above the flue tubes of steam boiler, this apparatus to be connected to the
steam space of the boiler, and also to a pipe through which the superheated
steam is conveyed to the cylinders of the steam engine. We also construct a
double chamber or box of a D form, with an outer and an inner casing, leaving
sufficient space for the steam between, and thus secure the action of the
heated gases in the smoke-box of boiler, and this box or chamber is connected
to the steam space of the boiler and to the cylinders of the engine. In con-
structing stationary boilers, we connect a series of tubes of convenient length
in a syphon or approximatively syphon form, placed within the flues or flue
tubes of boiler. We also connect one or more ends of these tubes to the
steam space of boiler, and to a pipe or pipes conveying the superheated steam
to the cylinders of the engine. We also construct a tube or tubes, one
within the other, the heated gases passing through the inner tube and around
the external portion of the outer tube or tubes, the space between being
occupied by the steam to be superheated. We connect these tubes or pipes
together at each alternate end, or otherwise, or they may be all connected
together at one end to a pipe or pipes from the steam space of boiler, the
other end or ends being connected to the steam pipe or pipes, so as to convey
the superheated steam to the cylinders of engine. For marine engines it will
only be necessary to modify the details of the above arrangements according to
the form of the boiler.
Having thus described the nature of the said Invention, we now proceed
to describe in what manner the same is to be performed, wherein we shall
refer to the accompanying Drawings, by the words, figures, and letters
following, that is to say :-
Figure 1, section of a stationary boiler with one form of arrangement of
apparatus for superheating of steam placed in the flue. Here B denotes the

page_text: steam pipe; A, A, the apparatus with outlet pipe C to convey superheated
steam to the cylinder. This apparatus (A, A,) consists of tubes or pipes;
which are constructed by placing within each of them an internal pipe of
smaller diameter, in such manner as to leave space between the said external
and internal pipe, the ends where necessary being closed, but not so as to
destroy the free passage way through the interior pipe independently of the
said space. The space aforesaid receives steam from the pipe B which com-
municates therewith, and not with the interior passage, and passes off the
steam by the pipe C, whilst the heat passes through the internal passage way
.aforesaid. Figure 2 is a transverse section, shewing the same arrangements
as shewn at Figure 1, the interior passage being seen at 1*, 2*, and the steam
space at X, either end being open in the same manner. Figure 3 a plan of
part of a boiler shewing our apparatus (A, A,) arranged as a syphon form, or
simple curved pipe without the steam spaces aforesaid, B being the steam
pipe, and C the outlet. Figure 4, transverse section of the aforesaid arrange-
ments shewn at Fig. 3. Figure 5, a longitudinal section of a part of a boiler,
shewing an arrangement of syphon or approximatively syphon-shaped pipes A, A,
the steam pipe being at C, and B being the outlet. Figure 6, transverse
section of the arrangement shewn at Figure 5.
Figure 7 shews an arrangement of superheating pipes suitable for marine
and other boilers, which has the tubes as aforesaid, and E and F receivers at
seach end of the superheating pipes, which superheating pipes are formed into
syphons, or syphon-like pipes by means of short curved pipes a, a, a, a, a, a,
with internal screws, whereby they are screwed on to the pipes A, the ends of
which are externally threaded to correspond with said internal thread.
Figure 8, end view of Figure 7. Figure 9, longitudinal section of part of a
portable or locomotive boiler; E, the inlet; A, A, the apparatus; C, the
outlet. Figure 10, the transverse section thereof. Figure 11 shews the
apparatus arranged within the smoke-box of a portable engine. Figure 12,
end view of the same; A is the pipe to convey the steam to the superheater;
B, another pipe, which, after. the steam passes through the superheater from
the farther side of stop, conveys the superheated steam to the cylinder; C is
the exhaust steam pipe from cylinder to the chimney or up-take.
The
stop (d) aforesaid is a division plate across the steam space of the D chamber,
to oblige the steam to traverse the curve from A to B.
.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, we declare that
we claim the use of pipes of what is known as the syphon form (or approxi-
.matively syphon form) when arranged and used in the manner described, so

page_text: as to constitute apparatus for superheating steam; and particularly the use of
the short syphon-form tubes screwed on or secured to straight tubes, making
entire syphon-form tubes (or approximately syphon-form tubes), constituting
apparatus for superheating steam.
Also the use of the aforesaid pipes formed one within the other, the interior
one being the passage for the heated gases and the like coming from the
furnace, and the space between the exterior and interior tube being for the
steam to be superheated, as herein-before described.
Also the use of the aforesaid double chamber of a D form, with an outer
and an inner casing connected together with a space between them, to admit
steam to be superheated, thus constituting the same apparatus for super-
heating steam.
In witness whereof, we, the said William Loader Allchin and William
Allchin, have hereunto set our bands and seals, this Eighteenth
day of June, in the year of our Lord One thousand eight hundred and
sixty-two.
20
Witness,
WILLIAM LOADER ALLCHIN.
L.S.)
WILLIAM ALLCHIN.
(L.S.)
EDWARD FLINT,
16, Albion Crescent,
Northampton.