Improvements in or relating to Portable Terra-cotta Stoves.
Year: 1895

page_text: Date of Application, 21st Mar., 1895-Accepted, 18th May, 1895
COMPLETE SPECIFICATION.
Improvements in or relating to Portable Terra-cotta Stoves.
I THOMAS ROBERTS of 34 Victoria Street Westminster in the County of
Middlesex, Stove Manufacturer, 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 alterations and improvements in stoves constructed of
terra-cotta, either in solid or granulated form, contained in between concentric
cylinders of sheet iron or other metal, the outer cylinder being perforated to permit
direct radiation of heat from the terra-cotta, and known in the trade as Roberts'
Patent Portable Terra-cotta Stoves for which Letters Patent were granted dated
the 16th March 1893 No. 5707.
Whereas these stoves have hitherto been constructed for the purpose of burning
coal, coke and wood, it is now proposed to adapt them by structural alterations as
hereinafter described, and by the application of the substance of terra-cotta, to the
consumption of gas, as gas stoves, which will retain all the advantages claimed for
Roberts' Patent terra-cotta stoves, not only in the materials employed, and as to
the recent method of construction under the aforesaid Letters Patent, but also in
emitting abundant and absolutely pure heat; i.e. heat which will not vitiate the
air, and which, in addition to the above advantages, will produce a perfectly
regular and unvarying temperature, capable of being increased or diminished at
will; thus rendering these stoves specially adapted for use in invalids' bedrooms,
amongst numerous purposes.
In order that my said invention may be understood I will refer to the drawings
accompanying this Specification in which Fig. 1 shews an elevation of my improved
stove and Fig. 2 vertical section of same.
The same letters denote the same parts in both views.
I make the stove of two cases a al preferably of sheet iron one smaller than the
other; and of any suitable shape, but preferably of cylindrical form and concentric,
united at top and bottom and at other points, and having a space between them of
about one inch at the top and slightly tapering towards the bottom and having a
fixed double top b to the cases; between the cases a a¹ I fill with terra-cotta m.
The cover bis provided with an opening fitted with a moveable cover c in order to
allow water etc., in suitable vessels to be heated.
In order that the stove may give light as well as heat and be attractive and
comforting in appearance, I make an opening d of any suitable width and height,
preferably arched at top and disclosing a radiating reflector e made of any suitable
material but preferably of copper. At the edges of this opening and between the
two cases or cylinders I fix a strong iron frame or support y. Near the top of the
stove I insert a nozzle n to provide for the escape of the products of combustion
and below this nozzle 1 fix, through the back of the cases a gas pipe / terminating
in a ring i or otherwise and provided with a number of illuminating or atmospheric
burners controlled by a tap on the outside of the stove.
h
Above the ring I attach to the stove an additional lining preferably of conical
form, starting just below the aforesaid nozzle and tapering to, and terminating at
the opening in the top herein before described; and in front of this lining, i.e..
opposite the stove nozzle n I make an opening l.
The object of the lining k is to compel the fumes from the gas firstly to ascend
directly to the top, and thence pass at once to the front of the stove before being

page_text: carried round the sides for the escape by the nozzle n. By this means the heat is
economized and the front of the stove is always hotter than the back, causing great
radiation of heat where it is most wanted, viz. in the room in which the stove is
placed.
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.) In portable terra-cotta stoves as hereinbefore described the employment of
gas for heating the same.
(2.) In portable terra-cotta stoves in which gas is employed as the heating
medium the use of the lining k substantially as and for the purposes set forth.
(3.) Portable terra-cotta stoves in which gas is employed as the heating medium
constructed substantially as set forth and shewn on the accompanying sheet of
drawings.
1 01-4 3 Mauch 100%
BROWNE & Co.,
9, Warwick Court, Gray's Inn, London, W.C., Agents for the Applicant.