Year: 1886

page_text: I, THOMAS FLETCHER of Thynne Street Warrington in the County of Lancaster
Gas Engineer do hereby declare the nature of this invention to be as follows:-
This Invention relates to atmospheric gas burners and has for its object to enable
two vessels or utensils and their contents to be heated over the same burner
without the existence of a useless flame between the vessels or utensils.
These Improvements consist in constructing or arranging the holes slits or
apertures through which the atmospheric gas or mixture of gas and air passes
before combustion in or upon two arcs or sets of concentric arcs of circles or of
converging lines or lines parallel to converging lines or in or upon or parallel with
lines intermediate between an arc or semicircle and a V or pair of converging lines.
The convex part of the arca or equivalent form or the approach of the converging
lines is constructed towards the centre of the burner and in some cases the outer
extremities of the arcs or of the convergent lines may be joined by straight or
curved rows of holes slits or apertures for passage of the combined gas and air.
Burners constructed according to these Improvements may be simultaneously
used for one vessel or utensil or for two vessels or utensils and when employed for
more than one the flame is or may be limited to the bottom or most effective
heating surface of each vessel and no unutilized gas is consumed, they may also be
applied to other purposes for which similar burners are ordinarily employed.

page_text: I, THOMAS FLETCHER of Thynne Street Warrington in the County of Lancaster,
Gas Engineer, do hereby declare the nature of this invention, and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement:-
This Invention relates to atmospheric gas burners and has for its object to
enable two vessels or utensils and their contents to be heated over the same burner
without the existence of a useless flame between the vessels or utensils.
These Improvements consist in constructing or arranging the holes slits or
apertures through which the atmospheric gas or mixture of gas and air issues
before combustion by preference in or upon two arcs or sets of concentric ares of
circles or in or upon converging lines or lines parallel with converging lines or in
or upon lines parallel with lines intermediate between arcs or semicircles and V's
or pairs of converging lines.
In some cases the outer extremities of the arcs or of the convergent lines may be
joined by straight or curved rows of holes slits or apertures for the exit of the
combined gas and air before combustion. Such an arrangement or construction
constitutes a twin burner with a single injection tube. When each or either
member of the twin burner has a decided convex or convergent form, the convex
or convergent part or one of the convex or convergent parts is by preference and
for greater convenience, constructed or arranged towards the centre of the twin
burner.
Burners constructed according to these Improvements may be simultaneously
used for one vessel or utensil or for two, when employed for more than one the
flame is or may be limited to the bottom or most effective heating surface of each
vessel and no unutilized gas is consumed while at the same time the flames are
sufficiently close to each other to be used under a single vessel.
And in order that my said invention may be more readily understood and
carried into practical effect I have hereunto appended a sheet of Drawings and
will now proceed to describe. the same with reference to the various Figures
thereon. In each of the figures similar letters are employed to denote similar
parts.
A is part of the injection tube in which the gas and air are combined before
issuing from the burners B B are the twin burners; C D E are dotted circles
representing positions which may be occupied by the cooking or other utensil or
utensils. When only one utensil is employed it may be placed over both burners
as indicated by the dotted circle D, when two are employed they may respectively
occupy the positions indicated by the circles CE,
I desire it to be understood that I do not limit myself to either the precise
forms or the relative proportions of parts indicated on the accompanying Sheet
of drawings; for example the branches connecting the twin burners with the
injection tube may be lengthened as shown in Fig. 6 where the burners are
represented as formed upon very short arcs of circles. of very large or infinite
diameter or equivalent straight or approximately straight lines.

page_text: I am aware that single bar and other similar forms of single burners have been
employed for simultaneously heating two vessels, but in such forms there has been
wasted flame between the vessels which it is the object of these Improvements
to avoid.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same may be performed, I desire it to be
understood that what I claim is :-
As an atmospheric gas burner, the construction combination and arrangement of
two distinct burners with one injection tube, the two burners being so arranged or
disposed relatively to each other that they may be jointly employed to heat a
single vessel or separately employed to beat two vessels, substantially as and for
the purpose herein before set forth and described.