FIRE-BARS AND FURNACES
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said Samuel Barlow at the Office
of the Commissioners of Patents on the 13th February 1882.
SAMUEL BARLOW, of Castleton in the County of Lancaster.
IN FIRE-BARS AND FURNACES."
"IMPROVEMENTS
This Invention consists first of a new form and construction of grate bar for the
furnaces or fires of boilers of various forms but more especially for those fired in
internal flues.
It further includes a curvilinear arrangement of the form in which the bars are
placed although the bars may be placed on a level as is usual with grate bars or
in any other suitable position or form.
:
The bars are in section like the head of a spear having the extremities upon
which the fire is laid sharply pointed like the edge of a chisel and being elongated
below for from two to four inches; they can be arranged to cross the draught of
the chimney flue at right angles so that the air drawn in by the chimney or flue
draught will impinge upon the depth of each bar and striking upwards will pass
into the fire and among the fuel and products of combustion through a wide
conical shaped mouth or entrance formed by the space between the tips of the
neighbouring bars giving plenty of room for the air to distribute itself: and as the
upper surface of the bar or bars is formed like a chisel edge or point, and the air-
space between the points or upper surfaces of the bar is so great, it is almost
impossible for the fuel to form a "clinker" which will fuse or adhere to the bars,
so that the bars are practically indestructible from this cause and will last for many
years.
By the curvilinear arrangement of these bars, a deep fire is ensured on each side
of the fire-box in internally fixed boilers: the middle or crown of the fire bars
may be raised so as to have the fire in the centre nearer the top of the flue fire-box,
and as the deep fire at the sides brings the heating power considerably below the
CD 077

page_text: usual level of the water in the boiler to which the bars so arranged are employed,
a very large addition is made to the area and heating power of the boiler, while
from the peculiar form of the bars much more air is admitted into the fire than
usual ensuring a more perfect combustion and a great economy of fuel and to a
large extent the consumption of the smoke. The bars can be cast singly or in
sets of two or more and in practice I find that if they are cast in blocks of six bars
to each block they act very well.
They may also be placed in single bars with any suitable movable or rocking
arrangement which can easily be worked by hand or by any other power. The
bars can also be cast so as to run longitudinally as is usual with ordinary fire-bars.
In this case it will be best for each block of a casting say of six or more or less
bars to have a kind of midfeather between each casting or block crossing at right
angles to the draught, so as to cause the air drawn in by the flue or chimney
draught to impinge upon this and enter the fire, thereby securing its effective
agency in combustion of the fuel, equal to what it would be, if each bar crossed
the draught line at right angles.
In connection with this arrangement of fire bars I also block up the draught on
the underside of the bars with a hollow casting in the form of a grindstone trough,
which may be perfectly impervious to the admission of air or may be perforated
so as to admit air necessary to a more complete combustion of the fuel, this is
surmounted by and connected to an air chamber above the level of the bars
(instead of the ordinary solid fire-brick bridge) in which air sufficient can be
admitted to ignite the products of combustion passing from the furnace and turn
into flame what would without it pass into the flue and chimney as smoke. No
fire-bricks are required in this bridge arrangement.

page_text: η τα
In pursuance of the conditions or the Letters ratent bied
by the said Samuel Barlow in the Great Seal Patent Office on the
11th August 1882.
SAMUEL BARLOW of Castleton in the County of Lancaster.
IN FIRE BARS AND FURNACES.”
“IMPROVEMENTS
This Invention consists first of a new form and construction of grato bar for the
furnaces or fires of boilers of various forms but more especially for those fired in
internal Aues.
It further includes a curvilinear arrangement of the form in which the bars are
placed; although the bars may be placed on a level as is usual with grate bars or
in any other suitable position or form.
The bars are in section like the head of a spear as represented at Fig. 1 on the
annexed Drawing having the upper extremities upon which the firo is laid sharply
pointed like the edge of a chisel and being elongated below for from two to
four inches; they can be arranged to cross the draught of the chimney flue at
right angles so that the air drawn in by the chimney or flue draught will impinge
upon the depth of each bar and striking upwards will pass into the fire and among
the fuel and products of combustion through a wide tapering mouth or entrance
formed by the space between the tips of the neighbouring bars giving plenty of
room for the air to distribute itself; and as the upper surface of the bar or bars
is formed like a chisel edge or point, and the air-space between the points or upper
surfaces of the bars is so great it is almost impossible for the fuel to form a
clinker" which will fuse or adhere to the bars, so that the bars are practically
indestructible from this cause and will last for many years.
"f
If preferred the bars may be arranged longitudinally or lengthwise of the flue,
and they may be either arranged in a curvilinear form as shown in the Drawings,
or in a straight and level line across the flue as usual.
Fig. 2 in the annexed Drawing is a section across the flue of a boiler at the
furnace end showing the bars arranged in a curvilinear form and placed in a
longitudinal position. Fig. 3. is a similar view showing the bars placed
transversely.
By the curvilinear arrangement of these bars a deep fire is ensured on each side
of the fire box in internally fired boilers; the middle or crown of the fire bars may
be raised so as to have the fire in the centre nearer the top of the flue fire box
see Figs 2 and 3. and as the deep fire at the sides brings the heating power con-
siderably below the usual level of the water in the boiler to which the bars so
arranged are employed, a very large addition is made to the area and heating
power of the fire and the evaporating power of the boiler, while from the peculiar
form of the bars much more air is admitted into the fire than usual ensuring a
more perfect combustion and a great economy of fuel and to a large extent the
consumption of the smoke.
The bars can be cast singly or in sets of two or more and in practice I find that
if they are cast in blocks of six bars to each block as shown in plan view at Fig. 5.
they act very well.
They may also be placed in single bars with any suitable movable or rocking
arrangement which can be easily worked by hand or by any other power. The
bars can also be cast so as to run longitudinally as is usual with ordinary fire bars
(sec plan view and section Fig. 4). In this case it will be best for each block of
a casting say of six or more or less bars to have a kind of midfeather a, a between
each casting or block crossing at right angles to the draught so as to cause the air

page_text: drawn in by the flue or chimney draught to impinge upon this and enter the fire
thereby securing its effective agency in combustion of the fuel, equal to what it
would be if each bar crossed the draught line at right angles.
In connection with this arrangement of fire bars I also sometimes block up the
draught, on the underside of the bars with a hollow casting in the form of a
grindstone trough, which may be perfectly impervious to the admission of air or
may be perforated so as to admit air necessary to a more complete combustion of
the fuel, this is surmounted by and connected to an air-chamber above the level
of the bars (instead of the ordinary solid fire-brick bridge) in which sufficient air
can be admitted to ignite the products of combustion passing from the furnace and
turn into flame what would without it pass into the flue and chimney as smoke.
No fire-bricks are required in this bridge arrangement.
Having now described the nature and object of my said Invention together with
the manner in which the same is to be or may be performed or carried into
practical effect I wish it to be understood that I do not confine myself to any
specified depth of bar nor to any particular arrangement of the same either
curvilinear or otherwise but I claim as my Invention.
The spear head section of fire bar by which the top of each bar terminates in a
sharp or chisel edge, and the air space between each two bars being widened
beneath and above, allows of a much freer circulation of air among the fuel, thus
preventing fusion of the bar and rendering it almost indestructible.
In witness whereof I the said Samuel Barlow have hereunto set my hand and
seal this Eighth day of August in the year of our Lord One thousand eight
hundred and eighty two.
SAMUEL BARLOW. (L.S.)