INVENTION IN STEAM BOILERS
Year: 1852

page_text: LETTERS PATENT to Archibald Slate, of Woodside Iron Works,
near Dudley, in the County of Worcester, Civil Engineer, for an
"INVENTION IN STEAM BOILERS."
Sealed the 20th April 1853, and dated the 17th December 1852.
PROVISIONAL SPECIFICATION left by the said Archibald Slate
at the Office of the Commissioners of Patents, with his Petition,
on the 17th December 1852.
I, ARCHIBALD SLATE, of Woodside Ironworks, near Dudley, in
the County of Worcester, Civil Engineer, do hereby declare the
nature of the said "INVENTION IN STEAM BOILERS" to be as follows: —
A great improvement in the power of the boiler may be effected
by placing an apparatus for heating air in the smoke box or flue,
and forcing the air through it, so as to be heated by the waste heat
of the boiler, while at the same time it is being forced along pipes
and through the tubular stays, or otherwise, into the flue chamber
of the boiler, at a pressure or with a velocity greater than the gases
or flame in the flue, so that the streams of hot air issuing from the
openings in the tubular stays will act like so many blow pipes upon
the incandescant gasses, and tend to increase the intensity of the

page_text: combustion, and also to consume the smoke. I so arrange the
blowing piston, that it can be made at pleasure to vary the quantity
of hot air into the flue chamber, without altering the speed of the
engine; and, in carrying out this improvement, I employ the valves
described in the Specification of my Patent of the Twenty-seventh
day of May, One thousand eight hundred and fifty-one, for "Im-
provements in Steam Engines and Steam Boilers, and in the
Passages and Valves for the Induction and Eduction, and Working
of Fluids."
SPECIFICATION in pursuance of the conditions of the Letters
Patent, filed by the said Archibald Slate in the Great Seal
Patent Office on the 15th June 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
ARCHIBALD SLATE, of Woodside Ironworks, near Dudley, in the
County of Worcester, Civil Engineer, send greeting.
of
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventeenth day of December,
One thousand eight hundred and fifty-two, in the sixteenth year
Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Archibald Slate, Her special license that I, the said
Archibald Slate, my executors, administrators, and assigns, or such
others as I, the said Archibald Slate, my executors, administrators,
or 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 the Isle of Man, an Invention for "CERTAIN IMPROVEMENTS IN STEAM
BOILERS," upon the condition (amongst others) that I, the said
Archibald Slate, by an instrument in writing under my hand and seal,
should particularly describe and ascertain the nature of the said In-
vention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within

page_text: six calendar inonths next and immediately after the date of the said
Letters Patent, as in and by the same, reference being had thereunto
will more fully and, at large appear.
NOW KNOW E, that, in compliance with the said condition, I,
the said Archibald Slate, do hereby declare the nature of my In-
vention, and in what manner the same is to be perforined, to be
particularly described and ascertained in and by the following state-
ment thereof (that is to say):
bustion.
My Invention of "Certain Improvements in Steam Boilers" consists
in encreasing the power of the boiler, by placing an apparatus for
heating air in the smoke box or flue chamber, and forcing the air
through it, so as to be heated by the waste heat of the boiler, while
at the same time it is being forced along pipes, and through the
tubular stays or otherwise, into the flue chamber of the boiler, at a
pressure or with a velocity greater than the gases or flame in the
flue, so that the streams of hot air issuing from the openings in the
tubular stays will be forcibly injected into and act like so many blow
pipes upon the incandescent gasses, and tend to increase the intensity
of the combustion, and also to produce a more perfect degree of com-
The heating apparatus, which may be of any ordinary
kind, is constructed and placed so that the heated air, or part thereof,
can be discharged hot into the ash pan, and take the place of the cold
air in supplying the fire. I arrange a blowing apparatus, which may
also be of an ordinary kind, so that it can be made at pleasure to
vary the quantity of hot air forced into the flue chamber, without
altering the speed of the engine. And, in carrying out this improve-
ment, I prefer to employ the valves described in the Specification of
my Patent of the Twenty-seventh day of May, One thousand eight
hundred and fifty-one, for "Improvements in Steam Engines and
Steam Boilers, and in the Passages and Valves for the Induction and
Eduction and Working of Fluids."
Having now described the nature of my said Invention and in
what manner the same is to be performed, I liereby declare that I
claim, as an improvement in steam boilers, the adaptation of a
heating apparatus placed in the smoke box or flue of the boiler,

page_text: through which heated air may be forced into the flue chamber of
the boiler, or into the ash pan, so that, in issuing into the fluc
chamber at a velocity greater than the gasses passing through it,
the air may be injected into the incandescent gass, and, in issuing
into the ash pan, the heated air may supplant or substitute itself for
the cold air in the way above described.
İn witness whereof, I, the said Archibald Slate, have hereunto
set my hand and seal, this Ninth day of June, One thousand
eight hundred and fifty-three.