IMPROVEMENTS IN GRIDIRONS
Year: 1858

page_text: LETTERS PATENT to William Clark, of 58, Chancery Lane, in the
County of Middlesex, Engineer & Patent Agent, for the Invention of
"IMPROVEMENTS IN GRIDIRONS."-A communication from Messieurs Poirot,
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the 1st
July 1858.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer & Patent Agent, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN GRIDIRONS," to be as follows:-
This Invention relates to new economic gridirons, the bars of which are to
a certain extent overlapped and raised one above another, & forming a surface
impassable in a line perpendicular to the general plane of the bars. What-
ever form the gridiron possesses, the bars may be single or double, & form
with the cross pieces a flat, curvilinear, or angular surface, at any degree of
inclination. This new gridiron is represented in the Drawing annexed.
Figure 1 is the plan of a rectangular gridiron, the cross pieces a, a, of which
are parallel to each other, & disposed in a parabolic curve.
Fig. 2 is a vertical section of a rectangular gridiron, showing the arrange-
ment of the bars. a, a, parallel transverse pieces, holding the hars at their
extremities; they are of the form of a parabolic curve. a, a, feet of the
gridiron, formed by the continuations of the curved cross pieces a, a;
b, b, S shaped bars, each being severally inclined, & the combination thereof
being also inclined according to the "radius vectors" of the parabola;

page_text: c, c, central bar, forming an intermediate ridge or hog back between the two
inclinations of the combined bars; e, e, V-shaped side bars, forming the sides
of the gridiron; f, canal into which all the bars empty the fat they contain;
h, handle of the gridiron.
Fig. 3 represents an economic circular gridiron, formed of a single bar
wound in a spiral form, & terminating in a fat reservoir k, the spirals being
superposed or raised one above the other, on the same principle as the rect-
angular gridiron above described.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the
30th December 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 53, Chancery Lane, in the County of Middlesex, Engineer & Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the First day of July, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-second year of
Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said William Clark, Her special licence that I, the said
William Clark, my executors, administrators, and assigns, or such others
as I, the said William Clark, my 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 GRIDIRONS," a communication from Messieurs Poirot,
Bouilliant, & Co., residing at Paris, upon the condition (amongst others)
that I, the said William Clark, my executors or administrators, by an instru-
ment in writing under my, 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, 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 I, the said William Clark, do hereby declare the
nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following

page_text: statement, reference being had to the Sheet of Drawings hereunto annexed,
and to the letters and figures marked thereon (that is to say):
This Invention relates to new economical gridirons, the bars of which are
to a certain extent overlapped and raised one above another, and forming a
surface impassable in a line perpendicular to the general plane of the bars,
whatever form the gridiron possesses. The bars may be single or double, and
form with the cross pieces a flat, curvilinear, or angular surface at any degree
of inclination. This new gridiron is represented in the Drawings annexed.
Fig. 1 is the plan of a rectangular gridiron, the cross pieces a, a, of which
are parallel to each other, disposed in a parabolic curve.
Fig. 2 is a vertical section of a rectangular gridiron, showing the arrange-
ment of the bars. a, a, parallel transverse pieces, holding the bars at their
extremities; they are of a curved form. a', a', feet of the gridiron, formed
by the continuations of curved cross pieces a, a; b, b, S-shaped bars, each
being severally inclined, and the combination thereof being also inclined,
according to the "radius vectors" of the "parabola;" c, c, central bar, forming
an intermediate ridge or hog back between the two inclinations of the combined
bars; e, e, v-shaped side bars, forming the sides of the gridiron; f, canal
into which all the bars empty the fat they contain; h, handle of the gridiron.
Fig. 3 represents an economic circular gridiron, formed of a single bar
wound in a spiral form, and terminating in a fat reservoir k, the spirals being
superposed or raised one above the other, on the same principle as the rect-
angular gridiron above described.
Having described the nature of this Invention, and the manner of per-
forming the same, I declare that what I claim as the Invention to be
protected by the herein-before in part recited Letters Patent is, the arrange-
ment and construction of gridirons above described, and as indicated by the
Drawings annexed.
In witness whereof, I, the said William Clark, have hereunto set my
hand and seal, this Thirtieth day of December, in the year of our
Lord One thousand eight hundred and fifty-eight.
Witness,
WILLIAM CLARK. (L.S.)
W. G. E.. SWINNOCK,
53, Chancery Lane,
London.