A NEW OR IMPROVED FURNACE BAR
Year: 1884

page_text: I, SAMUEL RICHARD SMYTH of Dacie Street, Clapham in the County of Surrey
Civil Engineer do hereby declare the nature of my invention for "A NEW OR
IMPROVED FURNACE BAR" to bo as follows:-
The object of this invention is to afford free passage through the furnace bars
for the enormous quantity of atmosphere requisite to produce proper combustion
of the fuel.
My improved furnace bar is both simple in construction and effective in opera-
tion. It consists of a thin edged truss bar-the belly or lower part of the bar
being as thin as the edge of a knife-spaces or openings are formed in the middle
of the bar through which the air freely circulates whereby the belly of the bar is
kept cool and acts as a girder truss to the upper portion which is in immediate
contact with the fire.
The face of the bar has curvilinear recesses and projections formed on each side
so that when two or more bars are placed in juxtaposition a series of interstices aro
left between them which serve as air ducts through which the air ascends while
the bar curves or tapers gradually from its face to the thin edge of the belly part
of the truss and thus the air spaces from bar to bar afford the largest possible spaco
for atmospheric circulation commensurate with a sufficient degree of strength thus
greatly promoting the proper combustion of tho fuol without deteriorating from
the durability of the bar.

page_text: COMPLETE SPECIFICATION.
I SAMUEL RICHARD SMYTH Ducio Street Clapham Surrey Civil Engineer do
hereby declare the nature of my invention for A NEW OR IMPROVED FURNACE
BAR and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :—
The object of this invention is to promote more perfect combustion of the fuel
in a furnace by affording free passage for the air through the furnace bars.
As furnace bars are now constructed they do not afford a free circulation of tho
atmosphere so that it can enter into combustion with the fuel in the furnace-It
must be borne in mind that the furnace bars play an important part in effecting
economy in the consumption of fuel and if badly constructed there is no proper
combustion either of the incandescent carbon or of the gases evolved from the
coal.
My improved furnace bar is both simple and effective and is so constructed that
when a set of such bars are fitted in a furnace they will afford free passage to the
enormous quantity of atmosphero necessary for the proper combustion of the fuel
therein which is about 450,000 cubic feet for the combustion of one ton of coal.
And in order that my said invention may bo better understood and readily
carried into effect I will now with the aid of the accompanying drawing (which
represents a view in sido elevation of one of my improved furnace bars) proceed
more particularly to describe and ascertain the same.
To carry out my invention I make the furnace bar in the shape of a girder and
form on each side of the top of the bar (a) alternate curvilinear projections and
recesses (b), (c) so that when two or more bars aro placed together side by side a
series of interstices or spaces are left between them which form air ducts through
which the air ascends-The lower part of the bar consists of a truss (d) that carries
the upper part or face of the bar Such truss tapers laterally to and terminates in
a thin edge (e) while spaces or openings (f) are formed therein through which the
air circulates freely thus keeping the truss cool and so prolonging the life of the
bar by preventing its being quickly burnt out.
By this novel simple and highly effective construction the circulation of the air
through a furnace is greatly increased thus producing far more perfect combustion
of the fuel than heretofore thereby economising the consumption of fuel at the
same time that such improved furnace bar possesses the requisite strength and
durability.
A set of my improved furnace bars literally supports the fuel on air as far as it.
is possible to do so-Such bars are made of cast iron with a small proportion of
burnt iron and they are moulded flat ways-The number of holes or openings in
the side of each bar may be either two three or more to suit the length and truss
of the bar.
I also construct the bar by forming the upper part of the bar of cast iron with
the truss part made of wrought iron to which the upper part is cast When the
top of the bars are burnt through the wrought iron trusses can be used over again
Ly casting fresh tops thereon,

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
Making any convenient number of alternate curvilinear projections and recesses
on both sides of the top of a furnace bar and providing such top with a tapered
girder truss having any suitable number of openings formed therein substantially
in the manner and for the purposes herein before specified and shewn.
Dated this 13th day of March 1885.
ELT & Co.,
33, Southampton Buildings, Holborn, London,
Agents for the Applicant.