IMPROVEMENTS IN COOKING AND BAKERS' OVENS
Year: 1872

page_text: LETTERS PATENT to Adolph Koettgen, of 39, Old Broad Street, in the
City of London, Merchant, for the Invention of "IMPROVEMENTS
IN COOKING AND BAKERS' OVENS." -A communication from abroad
by Jacob Joachim Kunstädter, of No. 16, Fabrikgasse, in the
TRU
COMPLETE SPECIFICATION filed by the said Adolph Koettgen at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 14th December 1872, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ADOLPHI
KOETTGEN, of 39, Old Broad Street, in the City of London, Merchant,
send greeting.
" IMPROVE-
WHEREAS I am in possession of an Invention for
MENTS IN COOKING AND BAKERS' OVENS," and have petitioned Her Majesty
to grant unto me, my executors, administrators, and assigns, Her Royal
Letters Patent for the same, and have made solemn Declaration that

page_text: the same was communicated to me from abroad by Jacob Joachim
Kunstädter, of No. 16, Fabrikgasse, in the City of Pesth, in the King-
dom of Hungary, Master Whitesmith.
NOW KNOW YE, that I, the said Adolph Koettgen, do hereby declare
that the following Complete Specification, under my hand and seal, fully
describes and ascertains the nature of the said Invention, and in what
manner the same is to be performed in and by the following state-
ment:-
The oven consists of two main portions; the top part within which
the cooking or baking is carried on; and that forming the fire-grate,
resting on the casing containing the ash pan. The portion within which
the baking is done consists of two sheet-iron casings, cylindrical and
concentric by preference. The top of the outer casing is closed by a
conical end of plate. Its similar bottom rests upon a ring rivetted to
the outer casing of the fire-grate. It is fitted with two or more pins
which drop into holes in brackets on the fire-box or fire-grate casing.
The whole oven is thereby rendered portable, as it is thus easily taken
into two pieces by lifting the upper part by means of two handles. The
outer casing is fitted with one, two, or more doors, one above the other.
At both the top and the bottom of the outer casing is rivetted a cross
piece, each drilled with a central hole for the reception of a spindle,
extending the whole vertical height of the casing. On the spindle is
pinned a loose ring resting on the cross piece; and on this ring is placed
a cast-iron plate. This plate forms the greater portion of the bottom of
the inner concentric casing, and it serves to control or break the too
violent action of the fire. Above this solid bottom within the casing is
another perforated bottom through which the heated air rises amongst
the articles being baked. The outer rim of the bottom is of sheet iron,
as also the cylindrical portion and the flat top of the inner casing which
is fitted with two doors. The whole can turn on the central spindle.
On this spindle are also fitted two discs one above the other resting on
rings pinned to the spindle, and cut out with segmental perforations;
these discs can also turn on the said central spindle. On these two rotative
discs are placed the loaves, cooking dishes, or other articles to be baked
or cooked. On the doors being shut these are completely enclosed.
Below and in the centre of the concentric casings is the grate, the
fire-gases from which make their way up between the inner and outer
casings, past the bottom and then up the cylindrical portion, and out at

page_text: the central hole into the chimney above.
From the central fire-grate
the fire-gases circulate between the concentric casings out above, thus
completely enclosing within a heated envelope the articles to be baked;
and the equality of action thereon is further ensured by the capability of
rotating both the discs on which they are placed and the casing con-
taining them.
The cylindrical portion of the outer casing is preferably made double
in order to be filled with sand to delay the transmission of heat outwards.
To further render intelligible the nature of these improvements a
Sheet of Drawings is appended, in which Fig. 1 is the longitudinal
clevation; Fig. 2 and 3 transverse sections; Fig. 4 and 5 sectional plans
respectively; while Fig. 6 shews the central spindle to a larger scale.
In all these Figures the similar letters refer to the same parts.
A is the fire-grate; B, the central spindle; C and D the upper and
lower discs; E, the inner casing; F, the outer casing; G, the perforated
bottom; H, the solid bottom of the inner casing; I, the sand casing or
covering; and K, K, the handles for lifting off the top portion.
Having now fully described my improvements in baking or cooking
ovens, I declare that what I claim is the above described construction of
baking oven, or any colourable imitation thereof.
In witness whereof, I, the said Adolph Koetgen, have hereunto
set my hand and seal, this Thirteenth day of December in the
year of our Lord One thousand eight hundred and seventy-two.