IMPROVEMENTS IN FURNACE PROVISIONAL SPECIFICATION
Year: 1881

page_text: LETTERS PATENT to Charles Whitfield, of Newcastle on Tyne, in the County
of same name, Engineer, for an Invention of "IMPROVEMENTS IN FURNACE
PROVISIONAL SPECIFICATION left by the said Charles Whitfield at the
Office of the Commissioners of Patents on the 13th January 1881.
CHARLES WHITFIELD, of Newcastle on Tyne, in the County of same name,
Engineer. "IMPROVEMENTS IN FURNACE BARS."
My Invention relates to an improved form of furnace bar specially adapted to
the furnaces of steam boilers, but applicable also to other furnaces.
The object of my Invention is to combine the advantages of hollow fire bars
with those of ordinary bars, so that while the air is conducted through the hollow.
bars to the back of the furnace or combustion chamber the ordinary bars shall
admit sufficient air through the spaces between them to keep up an active com-
bustion of the fuel on its introduction into the furnace.
With this object I construct the furnace bars in one length from front to back,
the front portion consisting of two or more bars of the ordinary section, joined at
a certain distance from the front, and forming one hollow bar for the remaining
portion of their length, the proportion of the length of the ordinary bars to that of
the hollow bars depending upon the requirements of the furnace as to combustion
of fuel, smoke consumption, and other circumstances.
By thus proportioning the length of the ordinary bars at the front to that of
hollow bars at the back of the furnace, I obtain control of the combustion of the
fuel at the front part of the furnace, where it is required, combined with durability
of the bars at the back part of the furnace, where the heat is most intense, and the
admission of a sufficient quantity of air through the hollow bars to mix with the
gases behind the bridge to increase combustion and consume smoke.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Whitfield in the Great Seal Patent Office on the
13th July 1881.
CHARLES WHITFIELD, of Newcastle on Tyne, in the County of same name,
Engineer. "IMPROVEMENTS IN FURNACE BARS."
My Invention relates to an improved form of furnace bar specially adapted to
the furnaces of steam boilers, but applicable also to other furnaces.

page_text: The object of my Invention is to combine the advantages of hollow fire bars
with those of ordinary bars, so that while the air is conducted through the hollow
bars to the back of the furnace or combustion chamber the ordinary bars shall
admit sufficient air through the spaces between them to keep up an active com-
bustion of the fuel on its introduction into the furnace.
With this object I construct the furnace bars in one length from front to back,
the front portion consisting of two or more bars of the ordinary section joined at
a certain distance from the front, and forming one hollow bar for the remaining
portion of their length, the proportion of the length of the ordinary bars to that
of the hollow bars depending upon the requirements of the furnace as to com-
bustion of fuel, smoke consumption, and other circumstances.
By thus proportioning the length of the ordinary bars at the front to that of
hollow bars at the back of the furnace, I obtain control of the combustion of the
fuel at the front part of the furnace, where it is required, combined with durability
of the bars at the back part of the furnace, where the heat is most intense, and the
admission of a sufficient quantity of air through the hollow bars to mix with the
gases behind the bridge to increase combustion and consume smoke.
DESCRIPTION OF DRAWINGS.
On the Sheet of Drawings hereunto appended, Figure 1 is a longitudinal section
of the front portion of an ordinary Lancashire or Cornish boiler flue, in which my
improved furnace bars are shewn applied.
Figure 2 is a back elevation of the same shewing the openings through the bars
and bridge, and through which the air with free oxygen passes into the flue or
combustion chamber, where the oxygen is at liberty to combine with the carbon,
carbonic oxide, and other unconsumed gases from the furnace.
Figure 3 is a transverse half section through the front portion of the furnace at
A, B, and Figure 4 is a half section through C, D, shewing the bars at this portion
to be hollow, the proportion of the hollow part to the total length of the bar being
regulated by the special requirements of the furnace.
Figure 5 is a plan of five of my improved furnace bars placed together and
shewing the manner in which the air spaces are distributed.
Having now described the nature of my Invention, and the manner in which I
propose to carry it into practice, I claim as novel, and secured to me by Letters
Patent hereinbefore in part recited,―
The construction of furnace bars, each consisting of two or more solid bars in
connection with one hollow bar, substantially as shewn and described.
In witness whereof, I, the said Charles Whitfield, have hereunto set my hand
and seal, this, Twelfth day of July, in the year of our Lord One thousand
eight hundred and eighty one.
Witness,
T. J. DANSON,
Patent Agent,
Newcastle on Tyne.
CHARLES WHITFIELD. (L.S.)