IMPROVEMENTS IN CHIMNEY FLUES
Year: 1881

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company,
Patent Solicitors, at Frankfort-on-the-Main, in the Empire of Germany, for
an Invention of "IMPROVEMENTS IN CHIMNEY FLUES." A communication
from the Soicety called "Gesellschaft des Emser Blei-und Silberwerks," of
Ems, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 20th October 1881.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN CHIMNEY
FLUES." A communication from the Society called Gesellschaft des Emser
Blei-und Silberwerks," of Ems, in the Empire of Germany.
"
This Invention relates to improvements in chimney flues of foundries, metal-
works, &c., and has for its object to present a larger surface to the volatile metallic
particles escaping through such flues, it having been found by experiments that the
amount of volatile metallic incrustation is directly proportionate to the square
surface of the flue-partitions.
The improvements are performed by placing thin vertical sheets of perforated
iron or other metal, wire-work, &c., in the flues, their direction being parallel to
the direction of the draught. Preferably I place the sheets of metal on or in small
transverse partitions at the bottom of the flues which are arranged at suitable
distances from each other, partially for securing the metal already deposed from
being drawn further by the draught, partially for supporting the sheets of metal.
At the top I secure the sheets or wire-work by means of hooks or such like.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 17th April
1882.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN CHIMNEY
FLUES." A communication from the Society called "Gesellschaft des Emser Blei-
und Silberwerks," of Ems, in the Empire of Germany.
The experiments and observations made during the last eight years at the Ems
lead and silver works have shown that the quantity of metallic particles or dust
deposited in the flues depends upon the superficial area of the flue-walls, and that it
increases and decreases in the same ratio as the inner surfaces of the flues.
The simplest and cheapest way of increasing the inner surface of the flues and of
the smoke chambers is the application of thin plates, woven fabrics or netting, in
the interior of the flues or chambers, by supporting, suspending, or otherwise
securing these plates or fabrics parallel to the direction of the draught so as not to
diminish essentially the section of the flue.
The annexed Drawing, Figure 1 and 2, which represents a flue furnished with
sheet iron and sieves, will serve to further explain this Invention. A is the flue, of
stone or brickwork; B are six pieces of sheet iron placed vertical and parallel with
the direction of the draught. The plates B, which generally extend from the floor
to the ceiling of the flue, are not in this case extending to the floor, but rest on
small walls C, of about 0.6 metres height, which are built across the flue at intervals
of 3 metres in order to prevent the particles already deposited from being again
carried away by the draught. At the top of the plates B are secured by wire to
the hooks D, applied in the vault of the Hue.
CLAIM.
The apparatus for increasing the deposition of metallic particles or dust in the
flues and smoke chambers of metallurgic works, substantially as described and
illustrated.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand
and seal, this Eleventh day of April, A.D. 1882.