IMPROVEMENTS IN THE CON- STRUCTION AND ARRANGEMENT OF BARS FOR FIRE-GRATES OF FURNACES
Year: 1874

page_text: LETTERS PATENT to Alexander Dick, of 110, Cannon Street, in the
City of London, for the Invention of "IMPROVEMENTS IN THE CON-
STRUCTION AND ARRANGEMENT OF BARS FOR FIRE-GRATES OF FURNACES."―A
communication from abroad by Emile -Schmitz, of Paris, in the
Republic of France.
- Scaled the 11th September 1874, and dated the 14th March 1874.
PROVISIONAL SPECIFICATION left by the said Alexander Dick at the
Office of the Commissioners of Patents, with his Petition, on the
14th March 1874.
I, ALEXANDER DICK, of 110, Cannon Street, in the City of London,
5 do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE CONSTRUCTION AND ARRANGEMENT OF BARS FOR FIRE-GRATES OF FURNACES,"
being a communication to me from abroad by Emile Schmitz, of Paris,
in the Republic of France, to be as follows:-
* This Invention consists in improvements in the construction of fire-

page_text: ९
bars, whereby the grate is easily kept free from ash, and that the
clinkers formed on the same can be easily detached therefrom, while at
the same time more perfect combustion of the fuel is ensured.
The bars are hollow and of a cylindrical form with holes or perforations
in the same, the latter being for the purpose of allowing the air to pass 5
through to assist in the combustion of the fuel. The said bars are
mounted in or on suitable bearings, so that they can, when desired, be
turned on their axes, either independently by means of a winch, or
together by means of pinions and rack, or by any other suitable means.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Dick in the Great Seal Patent Office
on the 14th September 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
DICK, of 110, Cannon Street, in the City of London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of March, in 'the year
of our Lord One thousand eight hundred and seventy-four, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Alexander Dick, Her special
licence that I, the said Alexander Dick, my executors, administrators,
and assigns, or such others as I, the said Alexander Dick, my exe-
cutors, 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 THE CONSTRUCTION AND ARRANGEMENT OF BARS FOR FIRE-
GRATES FOR FURNACES," being a communication to me from abroad
by Emile Schmitz, of Paris, in the Republic of France, upon the
condition (amongst others) that I, the said Alexander Dick, my
_executors or administrators, by an instrument in writing under my,
or their, or one of their hands and scals, should particularly describe
$6

page_text: the furnace. Each tube is perforated with a series of holes which admit
the air necessary for the combustion of the fuel. The interior of each
bar is of cylindrical form, and is terminated in the front by a square or
polygonal head, upon or in which a key is inserted, whereby the bar
may be turned in any direction on its axis, and for any number of
complete revolutions or fractions of revolution, as may be desired; or
the movement of the bars may be effected by means of racks and pinions,
as will be.well understood: An interval or space is obtained between
the bars and furnace door by means of moveable tumbrils (indicated
by the letter C), which may be withdrawn from their places in case of a
change of the bars in order to permit them to be lifted up on the space
between the bearings shewn at B and D and the threshold of the
furnace door. It should be mentioned that the bars employed may be
respectively of different diameters, and may be longitudinally of a conical
form. The surface of the exterior partitions of the bars may be provided
with roughnesses of any suitable character, either for the purpose of
increasing the action produced by the friction of the bars, or for operating
on the fuel.:
The operation of the bars is as follows:-If the air holes which are
formed in the bars and in contact with the fuel become stopped up by
ashes it is sufficient to turn the bars in any direction, when a clear
surface of grate will be restored underneath the grate. If the stopping
up of the holes arises from an accumulation of cinder or clinker the bars
should be moved by oscillation to the right and left, when the roughnesses
before mentioned will grind and throw the cinder or clinker into the
ash pan, until the lower portion of the fuel is thoroughly free and clear.
In both the above-mentioned operations the furnace door must be kept
constantly closed, so as to exclude the exterior cold air and to maintain
the full heat in the furnace, by which arrangement great economy in
the consumption of fuel will be effected, and a proportional calorific
power obtained.
.
.. Having thus declared and ascertained the nature of the said Invention,
and in what manner the same is to be performed, I would observe in
conclusion that what I consider novel and original, and therefore claim
as constituting the Invention secured by the said herein-before in part
recited Letters Patent is, the combination and arrangement of apparatus

page_text: and mechanism, substantially as and for the purposes herein-before
described and set forth, or any mere modification thereof.
In witness whercof, I, the said Alexander Dick, have hereunto
set my hand and seal, this Fourteenth day of September, in
the year of our Lord One thousand eight hundred and seventy-
four.