IMPROVEMENTS IN THE CONSTRUCTION OF WARM AIR STOVES
Year: 1885

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COMPLETE SPECIFICATION.
We HENRY HEWITT BRIDGMAN of 42 Poultry in the City of London Architect
and JOSEPH RUSSELL of Queen's Wharf Hammersmith in the County of Middlesex
Warming and Ventilating Engineer do hereby declare the nature of our invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF WARM AIR STOVES" and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:―
Our Improvements in the construction of Warm Air Stoves consist firstly in the
peculiar formation of the grates the bottom or fuel bearing bars of which are
prolonged and carried backwards beyond the back plate of the stove through
which the said bars pass the openings through which they pass being closed. by
shoulders or flanges cast on the said bars which shoulders press against the said
back plate of the stove The office of these prolongations of the grate bars which
become heated by conduction from the fuel consumed on the fore part of the same
is to beat the air which is admitted to the chamber through which the said
prolongations pass and from which chamber it may be let into the apartment in
regulated quantities as required It will thus be seen that the air is heated without
coming in contact with the fuel being drawn directly from the external air or if
required the air of the apartment may be circulated through the heating part of the
stove until fairly warmed when the supply may be taken from the external air.
The second part of our invention consists in forming a stove with a double grate
for use in large rooms or hospital wards the face lines of the two grates being
inclined to each other forming conveniently the second and fourth sides of a half-
octagon or first and third sides of a half-hexigon In a long apartment this form of
stove will enable the fires to be better seen and to be more effective in the warming
of the ends of the said apartment the fires more or less facing each end respectively
The space behind the back plates of the stoves above the prolongations of the grate
bars and the space between the stoves may be fitted with the usual baffle or
deflecting plates for directing the course of the air.
In the accompanying illustrations Fig. 1 shows a front elevation Fig. 2 a vertical
cross section and Fig. 3 a horizontal section of a stove as above described in which
A. A are the grate bars and B B their prolongations passing through the back
plates CC the joints being made good by the shoulders D D cast on the said bars
The air is admitted at E being regulated at pleasure and is either drawn from the

page_text: external air or the apartment as desired Passing into the chamber F it is brought
in contact with the prolongations of the fire bars between which prolongations it
passes and is thus thoroughly heated after which it is allowed to pass into the
apartment through the openings G G Figs. 1 and 3 also show the arrangement of
the double or duplex grate arranged as described so that each grate more or less
faces the respective ends of the apartment to one of the long sides of which the
stove is supposed to be fixed.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
1. The construction of warm air stoves as described and illustrated viz:-having
fire bars the prolongations of which are carried. backwards through the back plate
of the grate dividing the chamber behind it into two portions the lower one being
arranged for the reception of the cold air and the upper one containing the
warmed air.
2. The cross section of duplex or double grates as described and illustrated the
face lines of such grates being inclined to each other so as to present the fires' more
or less towards the ends of long apartments such as hospital wards.
Dated this 5th day of February 1885.
EDW E. ALLEN,
Agent for the Applicants.