IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR APPLYING SuperHEATED AIR TO THE FURNACES OP STEAM BOILERS, PARTICULARLY APPLICABLE TO MARINE STEAM BOILERS
Year: 1874

page_text: LETTERS PATENT to Frederick John Cheesbrough, of the Office for
Patents, 15, Water Street, Liverpool, in the County of Lancaster,
Consulting Engineer, for the Invention of "IMPROVEMENTS IN THE
METHOD OF AND APPARATUS FOR APPLYING SuperHEATED AIR TO THE FURNACES
OP STEAM BOILERS, PARTICULARLY APPLICABLE TO MARINE STEAM BOILERS."
-A communication from abroad by William Charles Ford, of
Brooklyn, in the County of King's, State of New York, United
States of America.
PROVISIONAL SPECIFICATION left by the said Frederick John
Cheesbrough at the Office of the Commissioners of Patents, with
his Petition, on the 19th December 1874.
"
I, FREDERICK John Cheesbrough, of the Office for Patents, 15, Water
Street, Liverpool, in the County of Lancaster, Consulting Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE METHOD OF AND APPARATUS FOR APPLYING SUPERHEATED AIR TO THE FURNACES
OF STEAM BOILERS, PARTICULARLY APPLICABLE TO MARINE STEAM BOILERS," (a
communication) to be as follows:
The object of this Invention is more effectually to introduce a current

page_text: of superheated air to the furnaces of marine steam boilers upon the top
of the fire and near the surface thereof for the purpose of intensifying
the surface of the fire by obtaining a more perfect combustion of the
fuel through the intermingling of the fresh or free hot air with the
inflammable gases at the surface of the fire.
This Invention consists of a pipe or series of pipes or flues combined
with the smoke stack or chimney or waste steam pipe, or both, and
arranged in the fire or smoke fluc, and connected to a jet pipe or a
series of jet pipes to deliver the hot air upon the surface of the fire at
the sides or in the front part of the furnace. The pipes or flues to be
arranged with reference to the smoke flues and fire surface as to heat
the air upon its passage through the pipes by the escaping heat of the
furnace.
An application of this Invention may be thus described :-Take two
marine boilers of known type set opposite cach other to leave a passage
way between them, the fronts of the boilers being turned towards each
other, and the furnaces thus facing each other. The two boilers are
connected over head by means of a steam chest and uptake or smoke
box connexion. The steam chest is arranged on the top of the uptake
or smoke box, and is connected to the steam space of the boilers by
means of suitable pipes or connexions. On the top of the steam chest is
fitted the smoke stack or chimney, large enough to embrace the flue or a
series of flues passing through the steam chest. This is a known type
of marine boiler, and the additions which constitute this Invention
consist,―
Firstly. Of a drum or casing made to encircle the smoke stack or
chimney, and large enough to leave a space between the outside of the
said chimney and the inside of the said drum or casing. The upper part
of this drum or casing is fitted with a series of vanes or nozzles to collect
the air in the drum or casing when the smoke pipe or chimney is in
motion in either direction by the moving of the ship, or when the wind
blows from any direction.
Secondly. A series of pipes are fitted in the smoke pipe or chimney,
the upper ends of which pipes terminate in long angular nozzles which
are fitted over corresponding shaped openings cut in the side of the
smoke stack or chimney, thus creating a passage or fluc from the drum
or casing to the said pipes. The pipes pass down through the flue or

page_text: flues of the steam chest and connect to horizontal pipes arranged in the
smoke box or uptake. These horizontal pipes run the whole length of
the smoke box, so that all the boilers in the series are connected to the
hot air blast or current.
Thirdly. A series of pipes connect these horizontal pipes to a pipe or
pipes set either in the furnace or arranged in the water space of the
boiler. The connecting pipes are fitted with valvos to regulate the flow
of hot air, and the pipe or pipes in the furnace or the water space are
fitted with a series of jet pipes or holes to diffuse the free air evenly over
the surface of the fire.
It will be seen that by this arrangement the air is collected in the
drum or casing and forced down the pipes by the motion of the chimney,
caused by the movement of the vessel in either direction. The air is
heated on its passage through the drum and pipes by the escaping or
waste heat of the furnace, and the furnace is kept supplied with a
current or blast of hot free air without the expenditure of any power or
fuel beyond what is consumed in the operation of the machinery of the
vessel.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Frederick John Cheesbrough in the Great Seal
Patent Office on the 18th June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FREDERICK
JOHN CHEESBROUGH, of the Office for Patents, 15, Water Street,
Liverpool, in the County of Lancaster, Consulting Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Nineteenth day of December, in the year
of our
Lord One thousand eight hundred and seventy-four, in the thirty-eighth
year of Her reign, did, for Herself, Her heirs and. successors, give and
grant unto me, the said Frederick John Cheesbrough, Her special licence
that I, the said Frederick John Cheesbrough, my executors, administrators,
and assigns, or such others as I, the said Frederick John Cheesbrough, 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,

page_text: and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN THE METHOD OF AND APPARATUS FOR APPLYING SUPERHEATED AIR TO THE
FURNACES OF STEAM BOILERS, PARTICULARLY APPLICABLE TO MARINE STEAM
BOILERS," a communication to me from abroad by William Charles Ford,
of Brooklyn, in the County of King's, State of New York, United
States of America, upon the condition (amongst others) that I, the
said Frederick John Cheesbrough, 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.
NOW KNOW YE, that I, the said Frederick John Cheesbrough, do
hereby declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in
and by the following statement, reference being had to the annexed
Drawings making part of this Specification, in which-
Figure 1 is a vertical section through the smoke stack, steam drum, or
chimney, and the fore part of two opposite boilers, showing the smoke
and steam connections and a vertical section through a furnace of each
boiler with this Invention applied to the several parts thereof. Figure 2
is a vertical section through Figure 3 on the line x, x. Figure 3 is a
horizontal section taken on the line y, y, of Figure 1, and Figure 4 is a 1
horizontal section through the furnace above the grate bars.
The object of this Invention is to more effectually introduce and
diffuse a current of superheated air in the furnace of a marine steam
boiler upon the top of the fire near the surface thereof for the purpose of
intensifying the surface of the fire by obtaining a more perfect com-
bustion of the fuel through the intermingling of the fresh or free hot air
with the inflammable gases at the surface of the fire.
This Invention consists of a pipe or a series of pipes or flues combined
with the smoke stack or steam chimney, or both, and arranged in the
fire or smoke flue and connected to a jet pipe, or a series of jet pipes to
deliver the hot air upon the surface of the fire at the sides or in the
front part of the furnace. The pipes or flues are so arranged with

page_text: reference to the smoke flues and fire surface as to heat the air
passage through the pipes by the escaping heat of the furnace.
upon
its
An application of this Invention is illustrated by the Drawings,
where A, A, represent two boilers set opposite each other to leave a
passage way between them, the fronts of the boilers being turned
towards each other to bring the furnaces on each side of the passage
way. The furnaces are shown by F, F. The two boilers are connected
overhead by means of a steam chest B and a smoke connection H. The
steam chest is arranged on the top of the smoke connection and is
connected to the steam space of the boiler by means of pipes C, C. On
the top of the steam chest is arranged the smoke stack D large enough
to embrace all the flues b, b, in the steam chest. These are the ordinary
parts of a marine steam boiler and its connections now in common use.
The additions which constitute this Invention consist,-
First. Of a drum a made to encircle the smoke stack, and large
enough to leave a place between the outside of the smoke pipe and the
inside of the drum, the upper part of this drum being fitted with a series
of vanes or nozzles a¹, a', to collect the air in the drum when the pipe is
in motion in either direction or when the wind blows from either
direction.
Second. A series of pipes d, d, fitted in the smoke stack D, the upper
ends of which pipes are formed in long angular nozzles, which are fitted
over corresponding shaped openings cut in the side of the smoke pipe to
create a passage or flue from the drum to the pipes. The said pipes pass
down through the flues 6 of the steam chest and connect to horizontal
pipes d'arranged in the smoke connection H. These horizontal pipes a
run the whole length of the smoke connection by which all the boilers
in the series are connected to the hot air blast or current. A small
steam pipe d is inserted into the pipes d'. These pipes d² have nozzles
d³ so that a jet of steam may be driven into the pipe f to draw the air
down and around the smoke pipe.
Third. A series of pipes f, f, connecting the pipes d' to a pipe or
pipes i set either in the furnace or arranged in the water space of the
boiler, as shown in Figure 4, the pipes f being fitted with valves J to
regulate the flow of hot air, and the pipes i being fitted with a series of
jet pipes or holes to diffuse the free air evenly over the surface of the
fire. The jet pipes may be screwed through the side plate of the furnaco

page_text: into the pipe in the manner shown, or they may be applied in any good
and sufficient manner to effect the end sought after.
It will be seen that by this arrangement the air is collected in the
drum a and forced down the pipes d by the motion of the smoke pipe in
either direction, that the air is heated on its passage through the drum
and pipes by the escaping or waste heat of the furnace, and that the
furnace is kept supplied with a current or blast of hot free air without
the expenditure of any power or fuel beyond what is consumed in the
operation of the machinery of the vessel.
Having now described the nature and extent of this Invention I claim
as the Invention communicated to me by my foreign correspondent, the
method substantially herein described of collecting and drawing or
forcing down the air and of delivering the same in the furnace upon the
surface of the fire by the motion of the vessel or smoko pipe, and of
heating the air on its passage through the superheating pipe by the
waste or escaping heat of the furnace.
In witness whereof, I, the said Frederick John Cheesbrough, have
hereunto set my hand and seal, this Seventeenth day of June, in
the year of our Lord One thousand eight hundred and seventy-
FREDERICK JOHN (L.S.) CHEESBROUGH.