IMPROVEMENTS IN FURNACES USED IN THE MANUFACTURE OF ZINC
Year: 1862

page_text: LETTERS PATENT to Friedrich Wilhelm Daehne, of Swansea, Glamorgan-r
shire, for the Invention of "IMPROVEMENTS IN FURNACES USED IN THE
MANUFACTURE OF ZINC:"
Sealed the 29th April 1862, and dated the 1st February 1862.
PROVISIONAL SPECIFICATION left by the said Friedrich Wilhelm Daehne
at the Office of the Commissioners of Patents, with his Petition, on the
1st February 1862.
I, FRIEDRICH WILHELM DAEHNE, of Swansea, Glamorganshire, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN FURNACES USED IN
THE MANUFACTURE OF ZINC," to be as follows:-
This Invention has for its object improvements in furnaces used in the
manufacture of zinc, and is applicable to that class of furnaces known as
Silesian zinc furnaces.
The improvements consist in causing atmospheric air to come in contact!
with the gases, arising from the fire-grate after they have left the grate and,
have traversed a portion of the furnace, whereby a complete ignition of the

page_text: unconsumed products of combustion is effected. By these means the pro-
portions existing between the fire-grate (and by consequence the consumption
of coal), and the furnace may be changed by extending the length of the
furnace, and introducing into the portion so added additional muffles, the
original dimensions of the fire-place or grate being at the same time retained,
or by reducing the dimensions of the grate and retaining the original
dimensions of the furnace. Openings are made in the roof in order to introduce
the atmospheric air (and by preference heated air) at intervals along the
central parts of the extended length of the furnace.
In constructing new furnaces.according to my Invention they are similarly
arranged.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Friedrich Wilhelm Daehne in the Great Seal Patent Office
on the 1st August 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRIEDRICH
WILHELM DAEHNE, of Swansea, Glamorganshire, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the First day of February, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-fifth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Friedrich Wilhelm Daehne, Her special licence that I, the said
Friedrich Wilhelm Daehne, my executors, administrators, and assigns, or such
others as I, the said Friedrich Wilhelm Daehne, my executors, administrators,
and assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN FURNACES USED IN THE MANUFACTURE OP ZINC," upon the
condition (amongst others) that I, the said Friedrich Wilhelm Daehne, my
executors or administrators, by an instrument in writing under my, or their,
or one of their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner. the same was to be.
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.

page_text: .
NOW KNOW YE, that I, the said Friedrich Wilhelm Daehne, do hereby
declare the nature of the said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
This Invention has for its object improvements in furnaces used in the
manufacture of zinc, and is applicable to that class of furnaces known as
Silesian zinc furnaces.
The improvements consist in causing atmospheric air to come in contact
with the gases arising from the fire-grate after they have left the grate and
have traversed a portion of the furnace, whereby a complete ignition of the
unconsumed products of combustion is effected. By these means the pro-
portions existing between the fire-grate (and by consequence the consumption
of coal), and the furnace may be changed by extending the length of the
furnace, and introducing into the portion so added additional muffles, the
original dimensions of the fire-place or grate being at the same time retained,
or by reducing the dimensions of the grate and retaining the original dimen-
sions of the furnace. Openings are made in the roof, in order to introduce the
atmospheric air (and by preference heated air) at intervals along the central
parts of the extended length of the furnace.
In constructing new furnaces according to my Invention they are similarly
arranged.
Having thus stated the nature of my Invention, I will proceed more fully
to describe the manner of performing the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shews a longitudinal section of a Silesian zinc furnace; Figure 2,
a plan thereof, taken in the line A, B; Figure 3 is a top view or plan of the
roof; and Figure 4 is a transverse section. The parts colored red indicate
the additions which have been made to an ordinary furnace, retaining the fire-
place previously used. E, E, are pipes by which air is supplied to the interior
of the furnace, and it is preferred to employ instruments G, represented at
Figures 5 and 6, for regulating the quantity of air admitted to the furnace.
The retorts in the end of the furnace near the fire-place are arranged as
heretofore, whilst the retorts used beyond are longer, as shown.
Other arrangements for introducing streams of air at proper intervals may
be employed. I would remark that I am aware that streams of air have been
introduced into other constructions of furnaces, I do not, therefore, claim the
introduction of streams of air into furnaces generally, my Invention consisting

page_text: in the construction of furnaces employed in the manufacture of zinc, and
applying streams of air thereto, as herein described..
In witness whereof, I, the said Friedrich Wilhelm Daehne, have here-
unto set my hand and seal this Twenty-ninth day of July, in the year
of our Lord One thousand eight hundred and sixty-two.
Signed, sealed, and delivered in the
presence of Edward Baron Wilstone,
of Swansea, Merchant..
EDW. BARON WILSTONE..
F. W. DAEHNE. (L.S.)