IMPROVEMENTS IN THE ADAPTATION OF AIR INLETS TO STOVES, FURNACES, WATER BOILERS, OR HEATING APPARATUS OF ANY DESCRIPTION, WHEREBY DANAWAGION OR WITH TO
Year: 1874

page_text: LETTERS PATENT to Thomas Hungate Preston Dennis, of the Anchor
Iron Works, Chelmsford, in the County of Essex, for the Invention
of "IMPROVEMENTS IN THE ADAPTATION OF AIR INLETS TO STOVES, FURNACES,
WATER BOILERS, OR HEATING APPARATUS OF ANY DESCRIPTION, WHEREBY
DANAWAGION OR WITH TO "
Sealed the 17th November 1874, and dated the 21st May 1874.
PROVISIONAL SPECIFICATION left by the said Thomas Hungate
Preston Dennis at the Office of the Commissioners of Patents,
with his Petition, on the 21st May 1874.
I, THOMAS HUNGATE PRESTON DENNIS, of the Anchor Iron Works,
5 Chelmsford, in the County of Essex, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN THE ADAPTATION OF AIR INLETS TO
STOVES, FURNACES, WATER BOILERS, OR HEATING APPARATUS OF ANY DESCRIPTION,

page_text: WHEREBY PERFECT COMBUSTION AND THE ECONOMIZATION OF FUEL IS SECURED," to
be as follows :―
In my Invention a heating apparatus with the necessary space for
containing heating materials being enclosed in a casing of iron or any
other suitable substance the whole is enclosed in another similar
casing. Perforations in the lower or any other part of the outer casing
admit atmospheric air to the space between the outer and inner casings.
Perforations leading to the heating materials or gasses in a state of
combustion are also provided in the lower part of the inner casing, but
these perforations only admit to pass through them a portion of the
atmospheric air which enters the outer casing. The remainder of the
atmospheric air (admitted by the outer casing) in seeking some outlet
by which it may escape traverses the space between the outer and
inner casings until it has become heated to a temperature above its
normal state, when perforations in the upper or farther part of the inner
casing allow it to pass through them, when it comes in contact with the
heating materials or gasses in a state of combustion.
Means are also employed for partially or wholly opening or closing
any or all of the perforations afore-mentioned.
Having thus described my Invention I would have it understood that
the Invention as described is equally applicable to stoves, furnaces, hot
water boilers, or heating apparatus of any description, and that what I
claim is, the adaptation or combination of means whereby atmospheric air
is caused to be heated before it enters the furnace of heating apparatus
to promote combustion, substantially as described.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Hungate Preston Dennis in the Great
Seal Patent Office on the 20th November 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
HUNGATE PRESTON - DENNIS, of the Anchor Iron Works, Chelmsford, in 3
the County of Essex, send greeting.

page_text: Letters Patent, bearing date the Twenty-first day of May, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-seventh
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Thomas Hungate Preston Dennis, Her
special licence that I, the said Thomas Hungate Preston Dennis, my
executors, administrators, and assigns, or such others as I, the said
Thomas Hungate Preston Dennis, 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 THE ADAPTATION
OF AIR INLETS TO STOVES, FURNACES, WATER BOILERS, OR HEATING APPARATUS
OF ANY DESCRIPTION, WHEREBY PERFECT COMBUSTION AND THE ECONONIZATION OF
FUEL IS SECURED,” upon the condition (amongst others) that I, the said
Thomas Hungate Preston Dennis, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
scals, 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
not and immediately after the date of the said
months

page_text: inner casings until it has become heated to a temperature above its normal
state, when it is conducted to perforations in the upper or further part of
the inner casing, through which it passes and comes in contact with the
heating materials or gases in a state of combustion.
2
11
1 11

page_text: atmospheric air is caused to be heated before it enters the furnace of
heating apparatus to promote combustion, substantially as herein
described and shewn on Drawings.
In witness whereof, I, the said Thomas Hungate Preston Dennis,
have hereunto set my hand and seal, this Fourteenth day of
November, in the year of our Lord One thousand eight hundred
and seventy-four.