IMPROVEMENTS IN FURNACES FOR CALCINING AND OTHER PURPOSES
Year: 1879

page_text: LETTERS PATENT to Robert Stirling Newall, of Ferndene, Gateshead upon
Tyne, in the County of Durham, for the Invention of "IMPROVEMENTS IN
FURNACES FOR CALCINING AND OTHER PURPOSES.”
Sealed the 19th Mac 1980 and debed the 2nd Dec 1970
PROVISIONAL SPECIFICATION left by the said Robert Stirling Newall
at the Office of the Commissioners of Patents on the 22nd December
1879.
ROBERT STIRLING NEWALL, of Ferndene, Gateshead upon Tyne, in the County
of Durham. "IMPROVEMENTS IN FURNACES FOR CALCINING AND OTHER
PURPOSES."
First. The Invention has for its object improvements applicable to furnaces for
calcining and other purposes, which have a horizontal rotating bottom or pan with a
central opening, such as that described in the Specification of James Mactear,
dated 17th May 1876 (No. 2073), and ny Invention consists principally in
combining with such rotating furnace an apparatus for stirring the materials operated
on in such furnace, and afterwards using the same apparatus for discharging rapidly
the materials through the central opening.
The apparatus I use for stirring and discharging the materials consists of a
number of ploughs arranged in a frame projecting through the roof of the furnace,
and nearly in the position of Mactear's rotating stirrers.
I give these ploughs a slight oscillating movement, so as to stir the materials by
moving them alternately towards and from the centre as the pan revolves, and
when they have been sufficiently operated on I place the ploughs at such an angle
that the materials are pushed by the rotation of the pan against the ploughs, and
out of the central opening; I thereby avoid the severe manual labour and loss of time
required in discharging Mactear's furnaces.
Second. The Invention has for its object an improvement in the furnace patented
by me, No. 3486, 15th September 1877, by which I exclude air from entering at
the space between the rotating circular bottom and the fixed brick work. I do this
by making a hollow or gutter close to the outside iron rim of the bottom. I fill
this gutter with sand or other suitable material, and I fix to the brickwork which
encloses the bottom a ring which dips into the sand in the gutter, and so prevents
the entrance of air.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Stirling Newall in the Great Seal Patent Office on the
22nd June 1880.
ROBERT STIRLING NEWALL, of Ferndene, Gateshead upon Tyne, in the County
of Durham. "IMPROVEMENTS IN FURNACES FOR CALCINING AND OTHER
PURPOSES."
The Invention has for its object improvements applicable to furnaces for calcining
and other purposes, which have a horizontal rotating bottom or pan with a central
opening, such as that described in the Specification of James Mactear, dated
Seventeenth May, One thousand eight hundred and seventy six, No. (2073), and
my Invention consists principally in combining with such rotating furnace an
apparatus for stirring the materials operated on in such furnace, and afterwards
using the same apparatus for discharging rapidly the materials through the central
opening.
The apparatus I use for stirring and discharging the materials consists of a
number of ploughs arranged in a frame projecting through the roof of the furnace,
and nearly in the position of Mactear's rotating stirrers. I give these ploughs a
slight oscillating movement so as to stir the materials by moving them alternately
towards and from the centre as tho pan revolves, and when they have been
sufficiently operated on I place the ploughs at such an angle that the materials
are pushed by the rotation of the pan against the ploughs and out at the central
opening; I thereby avoid the severe manual labour and loss of time required in
discharging Mactear's furnaces.
The Drawing hereunto annexed illustrates my said Invention. Fig 1 is a
horizontal plan, and Fig. 2 a vertical section of a rotating furnace pan supported on
wheels, rotating on a railway, and having a central opening through which the
materials operated upon are discharged.
The fire place is at a, and the flame passes over the surface of the materials
contained in the pan, and enters the flue leading to the condenser.
The frame containing the ploughs used for stirring the materials is inserted in
an opening in the roof of the furnace at b, b. The ploughs are fixed to axles c, c,
capable of moving in the frame, and a slight oscillating movement is communicated
to them by the cranks d fixed to their upper ends, which are noved to and fro by
the rotating crank pin e and connecting rod f, which is actuated by the steam
engine in the proportion of from six to ten throws of the crank to one rotation of
the furnace pan.
By this means the materials are thoroughly well stirred, and when they have
been sufficiently operated on, the ploughs are disconnected from the rotating crank
pin and fixed at such an angle as to cause them to push the materials out at the
central opening g, g, as the pan revolves, thus avoiding the severe manual labour
and loss of time required in discharging Mactear's furnaces.
I claim as my Invention, First. The combination of a rotating furnace having
a central opening for discharging the calcined materials with a series of ploughs,
arranged and worked as described.
And, Secondly. The giving the ploughs an oscillating movement, as and for the
purpose described.
In witness whereof, I, the said Robert Stirling Newall, have hereunto set my
hand and seal, the Twenty first day of June, in the year of our Lord
One thousand eight hundred and eighty.