Year: 1888

page_text: Date of Application, 25th Jan., 1888
Complete Specification Left, 25th Oct., 1888
Complete Specification Accepted, 30th Nov., 1888
I, DAVID THOMPSON, of Harper Street, Leeds, in the County of York, Gas
Engineer, do hereby declare the nature of my said invention to be as follows:-
The object of my invention is to effect improvements in the construction of ovens
heated by gas or oil fuel.
I construct the walls, back, roof, and other external parts of my improved ovens
preferably of iron plates, placed at a suitable distance apart, the spaces between the
plates being filled with any suitable non-conducting material; cast iron or mild steel
being used for frames, doors, and other parts as required.
The lower part of the oven, below the combustion chamber, is enclosed and fitted
so as to be used as a drying oven; sufficient heat being derived, for that purpose,
from the plate below the combustion chamber.
The combustion chamber is divided into two parts, by means of a rib or flange
running under the floor plate of the oven, and united thereto or cast in one therewith.
The floor plate is preferably made of mild steel, and in some cases the pipes and con-
ducting channels for gas or oil are cast in one therewith.
The ceiling of the oven is also preferably formed of mild steel, the upper side having
flanges, ribs, divisions, and other provisions cast thereon or attached thereto, for
dividing the chamber above the ceiling, and baffling, dividing, and guiding the
currents, and imparting stiffness to the plates.
I connect the combustion chambers below the floor, with the chamber above the
ceiling, by means of a number of metallic tubes (preferably of solid drawn steel) on
each side of the oven, with suitable nuts and other appliances to form air tight
joints.
A chimney or flue is placed at the back of the oven, to carry away the spent gases
and ais

page_text: A suitable number of atmospheric or other burners are fitted in the combustion
chambers below the floor of the oven, and above the drying oven, the front and lower
plate being provided with openings for lighting and admitting air to the combustion
chamber.
The operation of the oven is as follows:-The heated air from the burners in the
combustion chambers passes through the vertical tubes to the chamber or chambers
above the ceiling, and from thence to the flue. The tubes thereby become highly
heated, and impart heat, by conduction, to the air in the oven, thereby raising the same
to the required temperature for baking and cooking. The ceiling or roof of the
oven also receives and conveys some heat from the same source.
In some cases the drying oven is dispensed with, and the external walls may (if
preferred) be built with brick or stone or other suitable material; and other obvious
modifications may be made in my invention.
1000

page_text: I, DAVID THOMPSON, of Harper Street, Leeds, in the County of York, Gas Engineer,
do hereby declare the nature of my said invention 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 my invention is to effect improvements, in the construction of Ovens
heated by gas or oil fuel.
I construct the walls, back, roof and other external parts of my improved ovens
preferably of iron plates, placed at a suitable distance apart, the spaces between the
plates being filled with any suitable non-conducting material; cast iron or mild steel
being used for frames, doors, and other parts as required.
The lower part of the oven, below the combustion chamber, is enclosed and fitted
so as to be used as a drying oven; sufficient heat being derived, for that purpose,
from the plate below the combustion chamber.
The combustion chamber is divided into two parts, by means of a rib or flange
running under the floor plate of the oven and united thereto or cast in one therewith.
The floor plate is preferably made of mild steel, and in some cases the pipes and con-
ducting channels for gas or oil are cast in one therewith.
The ceiling of the oven is also preferably formed of mild steel, the upper side
having flanges, ribs, divisions, and other provisions cast thereon or attached thereto, for
dividing the chamber above the ceiling, and baffling, dividing, and guiding the
currents, and imparting stiffness to the plates.
I connect the combustion chambers below the floor, with the chamber above the
ceiling, by means of a number of metallic tubes (preferably of solid drawn steel) on
each side of the oven, with suitable nuts and other appliances to form air tight
joints.
A chimney or flue is fitted to carry away the spent gases and air.
A suitable number of atmospheric or other burners are fitted in the combustion
chambers below the floor of the oven, and above the drying oven, the front and lower
plate being provided with openings for lighting and admitting air to the combustion
chamber.
The operation of the oven is as follows: The heated air from the burners in the
combustion chambers passes through the vertical tubes to the chamber or chambers
above the ceiling, and from thence to the flue. The tubes thereby become highly
heated, and impart heat, by conduction, to the air in the oven, thereby raising the same
to the required temperature for baking and cooking. The ceiling or roof of the oven
also receives and conveys some heat from the same source.
In some cases the drying oven is dispensed with, and the external walls may (if
preferred) be built with brick or stone or other suitable material; and other obvious
modifications may be made in my invention.

page_text: And in order that my said invention may be particularly described and ascertained,
reference is hereby made to the accompanying drawings, in which similar letters of
reference indicate corresponding parts.
Fig. 1 is a front elevation, partly in section, and Fig. 2 is a horizontal section on
the line of Fig. 1.
a is the front of the oven. bb are the doors of the drying oven. cc are the com-
bustion chambers. d d are the burner tubes. ee are the flue tubes which convey the
heated gases to the chambers ff, and communicate heat by conduction to the air in
oven k. These tubes may be circular, elliptical, rectangular, or of any other suitable
section. The upper chamber is divided by vertical bafflers m m, which carry the gases
to the central passage g. h is the chimney, which may be placed over any part of
the flue g or at either end.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is:
1. The manufacture and use of ovens heated by gas or liquid fuel, substantially as
herein before described and illustrated by the drawings.
2. In ovens heated by gas or liquid fuel, the application and use of flue tubes e e
for the purpose of increasing the heating surface and economising fuel, substantially
as herein before described and illustrated by the drawings.
Dated 25th Octohan 1000
GEO. DOWNING,
8, Quality Court, London, W.C.
Agent for Applicant.