CERTAIN NEW AND IMPROVED PROCESSES FOR THE MANUFACTURE OP PLATE GLASS
Year: 1813

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
HEARD, of the Parish of Saint Luke, in the County of Middlesex, Chemist,
late Chemical Director of the London Plate Glass Works, East Smithfield,
send greeting.
WHEREAS His present Majesty George the Third, in and by His Letters
Patent under the Great Seal of the United Kingdom of Great Britain and
Ireland, bearing date at Westminster, the Ninth day of August now last past,
for Himself, His heirs and successors, did give and grant unto me, the said
Edward Heard, my executors, administrators, and assigns, His special licence,
full power, sole privilege and authority, that I, the said Edward Heard, my
executors, administrators, and assigns, and every of them, by myself and them-
selves, or by my and their deputy or deputies, servants or agents, or such others
as I, the said Edward Heard, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at all times
hereafter during the term of years therein expressed, should and lawfully might
make, use, exercise, and vend, within that part of the United Kingdom of Great
Britain and Ireland called England, the Dominion of Wales, and Town of
Berwick-upon-Tweed, my Invention of "CERTAIN NEW AND IMPROVED PROCESSES
FOR THE MANUFACTURE OP PLATE GLASS;" in which said Letters Patent there is
contained a proviso, obliging me, the said Edward Heard, by an instrument in
writing under my liand and seal, particularly to describe and ascertain the nature
of my said Invention, and in what manner the same is to be performed, and to
cause the same to be enrolled in His Majesty's High Court of Chancery within
six calendar months next and immediately after the date of the said recited

page_text: Letters Patent, as in and by the same (relation being thereunto had) may
more fully and at large appear, otherwise the said Letters Patent utterly to
cease, determine, and become void.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Edward Heard, do hereby declare the nature of my said Invention, and the
manner in which the same is to be performed, are particularly described and
ascertained as follows (that is to say):-
First, in the application or use of flints (previously reduced to a granular
state by suitable mechanical means, and afterwards sifted through sieves of
different sized meshes, in order to separate the required numbers or sized
grains) to be used as a substitute for or in lieu of sea, river, or other common
sands heretofore employed for abrading or grinding of plate glass, and which
ground glass and sand has hitherto been thrown away as useless.
Secondly, in the collecting or saving of the glass thus abraded in the inter-
mixed state with the ground flints, purifying the same from extraneous or
injurious matters, (and remelting it for the reproduction or composition of plate
glass, with an additional proportion of alkaline or other fluxes, the precise
quantity of which must be determined by experiment, the amount depending
on the presumed quantity of flints left in the combined mass.
In witness whereof, I, the said Edward Heard, have hereunto set my
hand and seal, this Ninth day of February, in the year. of our Lord
One thousand eight hundred and fourteen.
Inrolled the Ninth day of February, One thousand eight hundred and
fourteen.