AN IMPROVED VENTILATING APPARATUS FOR USE IN STEAM BOATS, VESSELS, AND OTHER PLACES REQUIRING TO BE VENTILATED
Year: 1865

page_text: LETTERS PATENT to John Garrison Woodward, of St. John, in the
Province of New Brunswick, Merchant, for the Invention of "AN
IMPROVED VENTILATING APPARATUS FOR USE IN STEAM BOATS, VESSELS, AND
OTHER PLACES REQUIRING TO BE VENTILATED."
PROVISIONAL SPECIFICATION left by the said John Garrison Woodward
at the Office of the Commissioners of Patents, with his Petition, on
the 10th October 1865.
I, JOHN GARRISON WOODWARD, of St. John, in the Province of New.
Brunswick, Merchant, do hereby declare the nature of the said. Invention
for "AN IMPROVED VENTILATING APPARATUS FOR USE IN STEAM BOATS, VESSELS,.
'AND OTHER' PLACES REQUIRING TO BE VENTILATED," to be as follows:-
My Invention is particularly applicable to steam vessels for ventilating the
engine and fire rooms. I make use of a casing surrounding the smoke pipe,
or contiguous thereto, so that the heat of the smoke stack or pipe shall heat
the air in the said casing, and cause it to rise. The lower end of this casing

page_text: opens directly into the engine or fire room, or is connected by pipes or trunks
with the space to be ventilated. The current of air ascending in the said
casing in consequence of being warmed by the smoke pipe draws the air out
of the space to be ventilated, and openings provided at the hatches, or in any
other convenient position, allow cool or fresh air to pass down and supply the
place of that drawn away as aforesaid. By connecting this ventilating space
with a hood or metal bonnet near the fire-doors all dust, heat, and gases are
drawn away, and do not escape into the fire room. This is particularly
advantageous when the fire is being supplied with fuel, or when it is drawn
out and extinguished. I extend the said ventilating casing up to the top of
or some little distance above the upper end of the smoke pipe, in order that.
the ventilating current as it ascends may aid the escape of gases and products
of combustion from the fire, and also aid in keeping currents of air or foggy
atmosphere from interfering with the draft through the boilers.
This ventilating apparatus, although especially adapted to steam vessels,
may be applied in buildings, vessels, or wherever available. I case the boiler
around with a casing of sheet metal a short distance away from the surface
of the boiler, in order that the boiler may not be cooled by the ventilating
everent of air, and I make said casing in sections held together by hoops or
its, so that one or more sections may be removed if access to the boiler
becomes necessary.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Garrison Woodward in the Great Seal Patent Office on
the 5th April 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
GARRISON WOODWARD, of St. John, in the Province of New Brunswick,
Merchant, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of October, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Jolin Garrison Woodward, Her special license that I, the said John,
Garrison Woodward, 'my executors, administrators, and assigns, or such others
as I, the said John Garrison Woodward, my executors, administrators, and

page_text: 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
"AN IMPROVED VENTILATING APPARATUS FOR USE IN STEAM BOATS, VESSELS, AND
OTHER PLACES REQUIRING TO BE VENTILATED," upon the condition (amongst
others) that I, the said John Garrison Woodward, by an instrument in
writing under my hand and seal, 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 John Garrison Woodward, do hereby..
declare the 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, reference being had to the Drawing hereunto annexed,.
and to the letters and figures marked thereon (that is to say) :-
I have represented a vertical section of said ventilating apparatus, as fitted
into a vessel. Great difficulty is experienced in the ventilation of engine.and.
fire rooms on board of steamboats and ships, in consequence of the confined
space and great heat radiated from the boilers and furnaces. Wind sails and
canvas tubes have been employed, and also ventilating pipes, but still the
temperature upon many steamboats, gunboats, monitors, and sea-going
steamships is so great that the engineers and firemen are often prostrated,
and are obliged to come upon deck frequently to enable them to continue
their duties.. Besides this the dust, sparks, and ashes very often blow about
the fire and engine rooms, particularly when the doors are opened. for charging
or raking the fires; and when it becomes necessary to draw out the fires and
extinguish the coals the heat, dust, steam, and dirt are very inconvenient and
oppressive.
.
The nature of my said Invention consists in a ventilating casing surrounding
or contiguous to the smoke pipe or funnel, through which air is drawn from
the engine and fire rooms by the column of air ascending by being warmed..
by the smoke pipe; this current.of air taken from the engine room conveys:
away any noxious: gases, dust, vapors, and also the heated. air, and in place
thereof the cool air will descend by a natural action. through the hatchways, .
thus rendering the engine room of an agreeable temperature, and this system.
of: ventilation may be extended by pipes.to the other portions of the vessel. .I

page_text: also carry the said ventilating case up above the top end of the smoke stack
or funnel of the boilers, in order that the ascending ventilating current of air
may increase the draft of air passing through the furnace.
In the Drawing a represents the bottom of the vessel or one of the decks.;
b represents the other deck; d is a boiler of any usual or desired construc-
tion; and is the smoke pipe or funnel, as usual; f is a casing surrounding
the funnel, and extending from the deck immediately above the boiler to the
top of and slightly above the said smoke pipe. The space between the
casing and the smoke pipe becomes an annular ventilator that takes up all
dust, vapors, heated air, &c., with a powerful circulating current induced by
the heat of the smoke pipe, and aids the draft to the fires by promoting the
escape of the products of combustion from the end of said pipe. The
annular ventilating space is connected at its lower end in any convenient
manner by a casing or pipes with the parts of the vessel to be ventilated.
In the Drawing the smoke pipe is shown at the furnace end of the boiler,..
and a partition or hood h, extending down near the front of the furnace to a
short distance above the fire doors, serves to direct the circulating current of.
air in such a manner as to convey away all dust and vapors, and prevent the
heat from coming into the engine room.
I have represented a casing i, made in sections so that it can be removed, s
surrounding the boiler, leaving an air space between itself and the boiler, the
object of which is to retain heat, and prevent the ventilating current of air
cooling the boiler too much. This casing is to be retained in place by hoops
running around the boiler, the metallic plates running lengthwise of said
boiler, and, if preferred, openings may be left in the casing at the points
1, 2, & 3, so that a small circulation of air may be allowed to prevent the
air becoming too much heated within the casing i.
What I claim and desire to secure by Letters Patent is,-
First, a ventilating casing around or contiguous to the smoke pipe or funnel
substantially as set forth, so that the ventilating current of air may be induced
by the heat of the smoke pipe as set forth.
Second, I claim extending the ventilating casing above the top of the
smoke pipe or funnel to increase the rapidity of the escape of the products of
combustion from said smoke pipe as set forth.
Third, I claim a partition or hood extending down in front of the furnace
at a short distance from the same in combination with the ventilating casing
around the smoke pipe as specified.
Fourth, I claim enclosing the boiler in a casing made of sheet metal a
.

page_text: short distance from said boiler, leaving an air space as set forth, said casing
being removable in sections as specified.
In witness whereof, I, the said John Garrison Woodward, have here-
unto set my hand and seal, this Fifth day of January, in the year of
our Lord One thousand eight hundred and sixty-six.
Witnesses,
LEMUEL W. SERRELL,
121, Nassau Street,
New York.
CHAS. H. SMITH,
121, Nassau Street,
New York.
J. G. WOODWARD. (LS.)