IMPROVEMENTS IN LIME KILNS AND SIMILAR KILNS
Year: 1870

page_text: LETTERS PATENT to Peter William Spencer, of Raygill, in Lothersdale,
in the Parish of Carlton, in the County of York, Gentleman, for the
Invention of "IMPROVEMENTS IN LIME KILNS AND SIMILAR KILNS."
Sealed the 10th May 1870, and dated the 15th March 1870.
COMPLETE DIECIFICATION med by the sa
ope
at the Office of the Commissioners of Patents, with his Petition and
Declaration, on the 15th March 1870, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
WILLIAM SPENCER, of Raygill, in Lothersdale, in the Parish of Carlton,
in the County of York, Gentleman, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN LIME KILNS AND SIMILAR KILNS," and have petitioned Her most Excellent
Majesty Queen Victoria to grant unto me, my executors, administrators,
and assigns, Her Royal Letters Patent for the same, and have mado
solemn Declaration that I am the first and true Inventor thereof.

page_text: NOW KNOW YE, that I, the said Peter William Spencer do hereby
declare the nature of the said Invention to be as follows:-
This Invention has for its object improvements in lime kilns and
similar kilns. In lime kilns, as at present constructed, when the fuel
and lime stone are both fed in at the top of the kiln much of the heat
is wasted. There is also a loss of fuel in consequence of partial
combustion.
According to my Invention in place of introducing the fuel at the top
of the kiln I introduce it at some distance down through the sides of the
shaft of the kiln. To do this I form a dome with an opening in the
crown, or I form arches across the kiln at the level at which it is desired
to introduce the fuel, and in the dome or arches I form a number of
passages into which the fuel is supplied, and by which it descends into the
kiln, the mouths of the passages within the kiln being on the under side
of the dome or arches and arranged at suitable distances apart. The
limestone in descending the shaft of the kiln passes through the dome
or by the side of the arch or arches, which are so formed as to afford
room for its descent. These arrangements ensure a more complete
combustion of the fuel, and a sufficient depth of limestone being over
the fire to absorb for the most part the heat which is liberated.

page_text: the maximum effect, there being a sufficient depth of comparatively cold
limestone over it to absorb the heat given off, so that the gaseous
products may escape from the kiln at the top at a low temperature.
The air to supply combustion rising up through the lime in the lower
part of the shaft cools the lime and prepares it for drawing, whilst at
the same time it becomes heated before it reaches the fuel; Figure 2 is a
section of the kiln shown at Figure 1, taken at the line A, A; Figure 3
is a vertical section of a kiln, in which arches are thrown across the
shaft of the kiln from side to side as a substitute for a dome; Figure 4
is a horizontal section taken at the line B, B, Figure 3. The letters of
reference correspond (with this exception) with the description already
given. Three arches e*, e*, e*, are here shown, a central arch spanning
the shaft diametrically and two side arches; by this arrangement all
parts of the shaft will be adequately supplied with fuel.
Having thus described the nature of my said Invention, and the
manner of performing the same, I would have it understood that what
I claim is, the constructing kilns in such manner that fuel may be
introduced into them at the same distance from the top of the shaft
through a dome, or an arch or arches thrown across the shaft at the
point where the introduction of the fuel is required, substantially as
hercin described.
In witness whereof, I, the said Peter William Spencer, have herc-
unto set my hand and seal, this Twelfth day of March, in the
year of our Lord One thousand eight hundred and seventy.
PETER WILLIAM SPENCER. (L.S.)