dad SHTATE ROTTED AND AND FURN
Year: 1871

page_text: LETTERS PATENT to James Raper, of Tong Street, Dudley Hill, near
Bradford, in the County of York, Machinist, and John Stephenson,
of the same Place, Engineer, for the Invention of
GRA Rido dad SHTATE ROTTED AND AND FURN
IMPROVEMENTS
PROVISIONAL SPECIFICATION left by the said James Raper and
John Stephenson at the Office of the Commissioners of Patents,
with their Petition, on the 7th February 1871.
We, JAMES RAPER, of Tong Street, Dudley Hill, near Bradford, in the
County of York, Machinist, and JOHN STEPHENSON, of the same Place,
Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN GRATE BARS FOR STEAM BOILER AND OTHER FURNACES," to
be as follows:-
The object of this Invention is to render grate bars more durable and
prevent them from warping, bending, or twisting and burning away by
the action of the fire. And the improvements consist in the peculiarity

page_text: of construction as follows:-We have three, four, or more longitudinal
bars of the usual form joined together by a series of short bars placed at
suitable distances apart, or so as to leave sufficient spaces or openings
for admitting a proper quantity of air into and for the passage of the
ashes out of the furnace, and the short bars in one bay are placed
opposite the spaces of the adjoining bay, the whole being cast together
forming a broad grate bar with the series of openings or gratings therein.
By this manner or kind of construction and arrangement of the gratings
we find a better or more equal distribution of the atmospheric air
admitted into the furnace is effected.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Raper and John Stephenson in the Great
Seal Patent Office on the 7th August 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JAMES
RAPER, of Tong Street, Dudley Hill, near Bradford, in the County of
York, Machinist, and JOHN STEPHENSON, of the same Place, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventh day of February, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said James Raper and John Stephenson,
Her special licence that we, the said James Raper and John Stephenson,
our executors, administrators, and assigns, or such others as we, the said
James Raper and John Stephenson, our executors, 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 GRATE BARS FOR STEAM BOILER
AND OTHER FURNACES," upon the condition (amongst others)..
that we,
the
said James Raper and John Stephenson, our executors or administrators,
by an instrument in writing under our, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of
the said Invention, and in what manner the same was to be performed,

page_text: and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that we, the said James Raper and John Stephenson,
do hereby declare the nature of our said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement and accompanying Sheet of Drawings
(that is to say) :—
The object of this Invention is to render grate bars more durable, or
prevent them from warping, bending, or twisting, and burning away by
the action of the fire. And the improvements consist in the peculiarity
of construction as follows:-We have three, four, or more longitudinal
bars of the usual form joined together by a series of short bars placed at
suitable distances apart, or so as to leave sufficient spaces or openings for
admitting a proper quantity of air into and for the passage of the ashes
out of the furnace, and the short bars in one bay are placed opposite the
spaces of the adjoining bay, the whole being cast together, forming a
broad grate bar with the series of openings or gratings therein. By
this manner or kind of construction and arrangement of the gratings,
we find a better or more equal distribution of the atmospheric air
admitted into the furnace is effected.
This Invention will be readily understood by reference to the accom-
panying Sheet of Drawings, where Fig. 1 is a plan view of a grate bar
constructed in accordance with our said Invention; Fig. 2 is a side view ;
Fig. 3 is a longitudinal section; Fig. 4 is a cross section; and Fig. 5 is
an end view of the same.
The peculiarity of construction of this grate bar will be quite evident
without any detailed description thereof, as it will be seen that there are
four longitudinal bars, and the two middle ones are deeper than the
outside ones, and that the cross bars of one bay or series betwixt two
longitudinal bars are arranged to be opposite the spaces of the adjoining
bays.
Figs. 6 and 7 are plan and cross section of another similar grate bar,
but with only three longitudinal bars.
Having thus described the nature of our said Invention, and shewn by
Drawings in what manner the same is performed or carried into practice,
we would have it understood that we do not confine ourselves to the

page_text: precise details in the construction; but what we claim as of our
Invention is, the construction and use of grate bars having three or
more longitudinal bars joined together by cross bars, in manner
substantially as shewn in the Drawings and herein described.
In witness whereof, I, the said James Raper, for and on behalf
of myself and the said John Stephenson, have hereunto set my
hand and seal, this Fifth day of August, in the year of our Lord
One thousand eight hundred and seventy-one.
Signed, sealed, and delivered,
by the within-named James
Raper, in the presence of
JOSEPH STEAD,
Clerk to W. Tasker,
Patent Agent,
Halifax & Bradford.
JAMES RAPER. (L.S.)