IMPROVEMENTS IN SUPERHEATING STEAM, AND IN APPARATUS CONNECTED THEREWITH.
Year: 1863

page_text: LETTERS PATENT to Thomas Baldwin, of Bury, in the County of Lan-
caster, Engineer, for the Invention of "IMPROVEMENTS IN SUPERHEATING
STEAM, AND IN APPARATUS CONNECTED THEREWITH.
PROVISIONAL SPECIFICATION left by the said Thomas Baldwin at the
Office of the Commissioners of Patents, with his Petition, on the 10th
April 1863.
I, THOMAS BALDWIN, of Bury, in the County of Lancaster, Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN SUPER-
HEATING STEAM, AND IN APPARATUS CONNECTED THEREWITH," to be as follows:-
For the purpose of superheating the steam before it enters the working
cylinders of steam engines I pass the steam from the boiler through any con-
venient number of tubes placed in a horizonal, vertical, or inclined position, the
said tubes being encased in a flue or chamber through which the hot gases
from a separate furnace to that used for generating the steam in the boiler
passes, and are diverted in their passage among the said tubes by plates of
metal or fire-clay, so as to cause the heat to be more equally diffused in the
said flue or chamber, or I use the said flue or chamber without the said plates
of metal or fire-clay when necessary. The hot gases from the said separate
furnace, after passing among the said tubes, are conveyed direct to the
chimney by a separate flue, or they are conveyed into the flue of the boiler, as
may be required. I place a damper in such a position as to regulate or prevent

page_text: the flow of the hot gases from the said separate furnace among the said tubes,
and I place another damper to allow the said hot gases to pass to the chimney
either along the flue of the boiler or through a separate flue to the chimney,
as may be required. The steam from the boiler, on its way to the working
cylinder, passes through the said tubes and becomes superheated by the action
of the hot gases from the separate furnace, thereby requiring less fuel to
produce a given mechanical effect than when used without being superheated.
I also use tubes placed one inside the other, the steam passing through the
space between the tubes, and the hot gases pass through the lesser tube and
arround the larger one. I place the said tubes in the flue or chamber before
named. In all cases where convenient I pass the steam from the boiler in
such a way that it shall flow through the heating apparatus in an opposito
direction to the flow of the hot gases from the furnace.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Baldwin in the Great Seal Patent Office on the
8th October 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
BALDWIN, of Bury, in the County of Lancaster, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of April, in the year of our Lord One
thousand eight hundred and sixty-three, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, givo and grant unto me, the
said Thomas Baldwin, Her special licenco that I, tho said Thomas Baldwin,
my executors, administrators, and assigns, or such others as I, the said Thomas
Baldwin, 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 SUPERHEATING
STEAM, AND IN APPARATUS CONNECTED THEREWITH," upon the condition (amongst
others) that I, the said Thomas Baldwin, 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.

page_text: NOW KNOW YE, that I, the said Thomas Baldwin, do hereby declare tho
nature of my said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement
and accompanying Drawings (that is to say):-
--
2
For the purpose of superheating the steam before it enters the working
cylinders of steam engines I pass the steam from the boiler through any
convenient number of tubes placed in a horizontal, vertical, or inclined posi-
tion, the said tubes being encased in a flue or chamber through which the
hot gases from a separate furnace to that used for generating the steam in the
boiler passes, and are diverted in their passage among the said tubes by plates
of metal or fire-clay so as to cause the heat to be more equally diffused in the
said flue or chamber, or I use the said flue or chamber without the said plates.
of metal or fire-clay when necessary. The hot gases from the said separate
furnace, after passing among the said tubes, are conveyed direct to the
chimney by a separate flue, or they are conveyed into the flue of the boiler, as.
may be required. I place a damper in such a position as to regulate or prevent
the flow of the hot gases from the said separate furnace among the said tubes,
and I place another damper to allow the said hot gases to pass to the chimney
either along the flue of the boiler or through a separate flue to the chimney,
as may be required. The steam from the boiler, on its way to the working
cylinder, passes through the said tubes and becomes superheated by the action;
of the hot gases from the separate furnace, thereby requiring less. fuel to
produce a given mechanical effect than when used without being superheated.
I also use tubes placed one inside the other, the steam passing through the
space between the tubes, and the hot gases pass through the lesser tubes and
arround the larger ones. I place the said tubes in the fluo or chamber before
named. In all cases where convenient I pass the steam from the boiler in
such a way that it shall flow through the heating apparatus in an opposite
direction to the flow of the hot gases from the furnace.
The accompanying Drawing shows an arrangement with the tubes lying
horizontally. Fig. 1 is a plan, Fig. 2 an end view, and Fig. 3 a side view
with parts in section.
The steam from the boiler h or boilers h, h₁, passes through the pipes b into
the box c, to which the tubes a are secured at one end, then through the said
tubes a and into the box c, to which the tubes a are secured at the other end,
and from thence to the engine through the pipe b₁. The furnace d for super-
heating the steam is placed, by preference, as shown in Figs. 2 and 3, when
two or more boilers are used; but when only one boiler is used the furnace d
is placed on the side of the boiler in the most convenient position for firing

page_text: and admission of the hot gases to the boiler flue or chimney. The heated
gases pass from the furnace d along the passage e and among the tubes a, and
through the passage for f₁, Fig. 1, as shown by the dotted lines and by the
arrows in Fig. 3, as may be required. The passages f, f₁, open into the flues
of the boilers, and are opened or closed when required by the dampers i, .
The tubes a are enclosed in the flue or chamber 9 through which the hot gases
from the furnace pass. When the hot gases from the furnace d are intended
to pass to the chimney instead of passing into the flue or flues of the boiler, a
separate flue is made for the purpose, and a damper or dampers placed therein.
The chamber g is formed of fire-brick or other similar material.
Having thus described the nature of my Invention, and the manner in
which the said Invention is to be performed, I wish it to be understood that
what I claim is, the passing of the hot gases from a separate furnace through
a chamber or chambers containing tubes, or through tubes and into the flue
or flues of a steam boiler or steam boilers, or passing the said gases directly
from the said chamber or chambers, or from the said tubes into the chimney
used to carry away the products of combustion from boiler furnaces, as herein
described, and for the purpose herein set forth.
Also the placing a furnace in the brickwork between two boilers, and the
apparatus and combination of parts for superheating steam, as herein set forth
and described.
In witness whereof, I, the said Thomas Baldwin, have hereunto set my
hand and seal, this Seventh day of October, in the year of our Lord
One thousand eight hundred and sixty-three.
THOMAS BALDWIN. (L.B.)