IMPROVEMENTS IN TREATING CALCAREOUS. AND DOLOMITE MARL AND FURNACES OR OVENS THEREFOR "
Year: 1883

page_text: LETTERS PATENT to Robert Bowman, Analytical Chemist, of Gateshend upon.
Tyne, Charles Rudolph Cowens, Limeburner, of Wingate, and William Joyce
68
Smith, Limeburner, of Trimdon all in the county of Durham for an Invention
of IMPROVEMENTS IN TREATING CALCAREOUS. AND DOLOMITE MARL AND
FURNACES OR OVENS THEREFOR
"
PROVISIONAL SPECIFICATION left by the said Robert Bowman, Charles
Rudolph Cowens, and William Joyce Smith at the Office of the Commissioners
of Patents on the 15th August 1883.
ROBERT BOWMAN, Analytical Chemist, of Gateshead upon Tyne, CHARLES
RUDOLPH COWENS, Limeburner, of Wingate, and WILLIAM JOYCE SMITH,
Limeburner, of Trimdon, all in the county of Durham "IMPROVEMENTS IN
TREATING CALCAREOUS AND DOLOMITE MARL, AND FURNACES OR OVENS
THEREFOR
"
Hitherto in the winning and working of limestone the high percentage of marl
bas materially enhanced the cost of such winning and working, now our invention.
relates to an improved method for the utilisation of calcareous and dolomite marl
whereby a great saving of cost is effected
In carrying out our invention we burn the calcareous and dolomite marl by
admixture with coal charged into a firebrick furnace or oven, which furnace or
oven is divided into shelves or beds the mixture being raked from one bed or shelf
to the other at stated intervals.
By this process the marl being burnt becomes more valuable as a marketable
material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Robert Bowman, Charles Rudolph Cowens, and William Joyce
Smith in the Patent Office on the 15th February 1884.
.
ROBERT BOWMAN, Analytical Chemist of Gateshead upon Tyne, CHARLES
RUDOLPH COWENS, Limeburner, of Wingate and WILLIAM JOYCE SMITH,
Lineburner of Trimdon all in the county of Durham "IMPROVEMENTS IN
TREATING CALCAREOUS AND DOLOMITE MARL, AND FURNACES OR OVENS
THEREFOR"
Hitherto in the winning and working of limestone the high percentage of marl
has materially enhanced the cost of such winning and working, now our invention
relates to an improved method for the utilisation of calcareous and dolomite marl
whereby a great raving of cost is effected."
In carrying out our invention we burn the calcareous and dolomite marl by
admixture with coal charged into a firebrick furnace or oven, which furnace or
oven is divided into shelves or beds the mixture being raked from one bed or shelf
to the other at stated intervals.
In order to enable our invention to be fully understood we will now proceed to
describe the same by reference to the accompanying drawing in which figure 1 is
a plan, figure 2, a vertical section and figure 3, a transverse section on the line A B
of figure 2, shewing a furnace or oven for treating calcareous and dolomite marl
constructed according to our improvements. a, a, a, a³, are the series of shelves
or beds arched as shown in figure 3. The top shelf a, is charged from the
hopper b, with the hereinbefore described mixture which is spread evenly over the
surface by me ins of a rake introduced through the corresponding door c, of this
shelf; the mixture is allowed to lie on the shelf a, for a certain length of time and
is then raked forward and allowed to fall onto the shelf a', and so on until the
mixture arrives on the shelf a', when it is drawn forward through the door e*,
into the barrow d, the process is thus continuous for as soon as the charge of
mixture on the shelf a, falls onto the shelf a¹, the first shelf a, is again charged
from the hopper b; c, cl, c², c³, and c are the raking doors respectively of the
shelves a, a, a, a³, and a,.
Before charging the furnace with the mixture the shelves or beds are brought to
a red heat by firing the shelves a¹, and a², with coke and when the furnace is once
so heated the heat will be retained by the charge itself.
The furnace is drawn by means of a chimney at g; the sides of the furnace are
stayed as shewn in figure 1, by means of flat bottomed rails e, and eye bolts f,
By the herein before described process the marl being burnt becomes more
valuable as. a marketable material.
Having thus described our said invention and the manner of performing the same
we would have it understood that what we claim is:-
The improvements in treating calcareous and dolomite marl and furnaces therefor
as hereinbefore described and represented in the accompanying drawing.
In Witness whereof I the said Charles Rudolph Cowens for and on behalf of
myself and the said Robert Bowman and William Joyce Smith have hereto set my
hand and seal this fourteenth day of February in the year of our Lord one
thousand eight hundred and eighty four
AARENVA