NEW METHOD OF CASTING ALL SORTS OF HINGES READY JOINTED, OR WITH FALSE KNICKLES, OR JOINTS AND PINS, IN CAST IRON, AND THAT THE SAID INVENTION AND IMPROVEMENT WOULD BE OF GREAT BENEFIT TO THE PUBLICK IN GENERAL, AND MIGHT BE PUR- CHASED ON MUCH MORE REASONABLE TERMS THAN THOSE HINGES AT PRESENT IN USE, WHICH ARE COMPOSED OF HAMMERED IRON
Year: 1775

page_text: IZON & WHITEHURST'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, JOHN IZON
and THOMAS WHITEHURST, of the Parish of Aston, near Birmingham, in the
County of Warwick, Brass Founders, send greeting.
WHEREAS the said John Izon and Thomas Whitehurst did, by their
Petition, humbly represent unto His most Excellent Majesty King George
the Third that the said John Izon, by application and study, and at a con-
siderable expence, had invented and brought to perfection a " NEW METHOD
OF CASTING ALL SORTS OF HINGES READY JOINTED, OR WITH FALSE KNICKLES, OR
JOINTS AND PINS, IN CAST IRON, AND THAT THE SAID INVENTION AND IMPROVEMENT
WOULD BE OF GREAT BENEFIT TO THE PUBLICK IN GENERAL, AND MIGHT BE PUR-
CHASED ON MUCH MORE REASONABLE TERMS THAN THOSE HINGES AT PRESENT IN USE,
WHICH ARE COMPOSED OF HAMMERED IRON;" and the said John Izon and Thomas
Whitehurst, by such their Petition, prayed His Majesty to grant unto them
His Letters Patent to secure the sole use and benefit thereof to them, their
executors, administrators, and assigns, and His said Majesty, being graciously
inclined to condescend to their request, did, by His Royal Letters Patent,
bearing date at Westminster, the Third day of October, in the fifteenth year of
His reign, givo and grant unto the said John Izon and Thomas Whitehurst,
their executors, administrators, and assigns, especial licence, full power, sole
priviledge and authority, that they, the said John Izon and Thomas White-
hurst, their executors, administrators, and assigns, and every of them, by
themselves, or by their deputy or deputies, servants or agents, or such others as
they, the said John Izon and Thomas Whitehurst, their executors, adminis-
trators, or assigns, should at any time agree with, and no others, from time
to time and at all times thereafter during the term of years therein-after
expressed, should and lawfully might make, use, exercise, and vend their said
Invention within that part of His Majestie's Kingdom of Great Britain called

page_text: England, His Dominion of Wales, and Town of Berwick-upon-Tweed, in such
manner as to them them, the said John Izon and Thomas Whitehurst, their
executors, administrators, and assigns, or any of them, should in their discretions
seem meet, and that they, the said John Ison and Thomas Whitehurst, should
and lawfully might have and enjoy the whole profit, benefit, commodity,
and advantage from time to time coming, growing, accrewing, and arising
by reason of the said Invention, for and during the term of years therein
mentioned, to have, hold, exercise, and enjoy the said licence, powers,
priviledges, and advantages therein-before granted or mentioned to be granted
unto the said John Izon and Thomas Whitehurst, their executors, adminis-
trators, and assigns, for and during and unto the full end and term of fourteen
years from the date of the said Letters Patent next and immediately ensuing,
and fully to be compleat and ended, according to the Statute in such case
made and provided; in which said Letters Patent is contained a proviso that
if the said John Izon and Thomas Whitehurst should not particularly describe
and ascertain the nature of their said Invention, and in what manner the same
is to be performed, by an instrument in writing under their hands and seals,
and cause the same to be inrolled in the High Court of Chancery within four
calender months next and immediately after the date of the said Letters Letters
Patent, that then the said Letters Patent, and all liberties and advantages
whatsoever thereby granted, should utterly cease, determine, and become void,
anything therein-before contained to the contrary thereof in anywise notwith-
standing, as in and by the said Letters Patent, relation being thereunto had,
more fully and at large may appear.
NOW KNOW YE, that the said John Izon and Thomas Whitehurst, in
pursuance of the said recited proviso, do, by this Instrument in writing under
their hands and seals, particularly describe and ascertain the nature of their
said Invention, and the manner in which the same is to be performed, in
manner following, that is to say:-
References to the Table of Contents delineated in the Margin hereof, with
Instructions for Casting of Iron Hinges ready jointed (viz³) :--A, the pattern of
the one side of a hinge from which you mould or make an impression in sand.
B, the false knuckles and pins laid into the joint part of the impression. From
A pour your metal, and when cold draw the pins, and the kuckles will fall
out, which makes C. C then must be neald or softened in a pan covered with
clay, and put in a moderate fire for fifteen hours or more; when cold the
pinhole must be bored, to admit a larger pin, which being put in makes D ;
then make an impression in sand from E, and lay in D on one side of the
impression; then pour your metal into it, which makes F a hinge ready jointed,
which must be again nealed or softened, as above, to admit of filing. It is

page_text: ecessary in B to have two pins, which meet in the middle knuckle, by reason
hey draw out easier in hinges of four joints; but in hinges of two joints one
in is sufficient, with two knuckles, one at each end. The knuckle, as
escribed in B, may be soldered to a barr or ridge, but the best method is as
bove described.
In witness whereof, the said John Izon and Thomas Whitehurst have
hereunto set their hands and seals, the Sixteenth day of December, in
the sixteenth year of the reign of our Sovereign Lord George the
Third, by the grace of God of Great Britain, France, and Ireland
King, Defender of the Faith, and so forth, and in the year of our
Lord One thousand seven hundred and seventy-five.