A MILL OR MACHINE FOR THE PURPOSE OF GRINDING AND POLISHING ALL SORTS OF GLASS, AND AT THE SAME TIME SIFTING AND SERVING THE SAND USED FOR THAT PURPOSE
Year: 1782

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, JOHN JOAD,
of the Will of Ramsgate, in the Isle of Thanet, in the County of Kent,
Upholder and Glass Grinder, sendeth greeting.
WHEREAS, by certain Letters Patent under the Great Seal of Great
Britain, bearing date at Westminster, on or about the Nineteenth day of
September, in the year of our Lord One thousand seven hundred and eighty-
two, after reciting, or taking notice therein, that the said John Joad
had, by his Petition, humbly represented unto His Majesty that he had,
after some labour and expence, invented and brought to perfection "A
MILL OR MACHINE FOR THE PURPOSE OF GRINDING AND POLISHING ALL SORTS
OF GLASS, AND AT THE SAME TIME SIFTING AND SERVING THE SAND USED FOR
THAT PURPOSE," and which he apprehended would be of great public utility,
and that in regard he, the said John Joad, was the first and sole Inventor
thereof, and that the same had never been made or used by any other person
or persons, to the best of his knowledge and belief, the said John Joad prayed
that His Majesty would be pleased to grant unto him, his executors, admi-
nistrators, and assigns, His Royal Letters Patent under the Great Seal of
Great Britain, for the sole use, benefit, or advantage of the said Invention,

page_text: within that part of the Kingdom of Great Britain called England, Dominion
of Wales, and Town of Berwick-upon-Tweed, for the term of fourteen years,
according to the Statute in that case made and provided; and His said
Majesty being willing to give encouragement to all arts and Inventions which
might be for the publick good, was graciously pleased to condescend to the
said John Joad's request, and did therefore, of His special grace, certain
knowledge, and meer motion, for Himself, His heirs and successors, grant unto
the said John Joad, his executors, administrators, and assigns, His special
licence, full power, sole priviledge and authority, that he, the said John Joad,
his executors, administrators, and assigns, and every of them, by himself
and themselves, or by his or their deputy or deputies, servants or agents,
or such others as he, the said John Joad, his executors, administrators, or
assigns, should at any time agree with, and no others, at all times there-
after during the term of years therein expressed, should and might make,
use, exercise, and vend his said Invention within that part of the Kingdom
of Great Britain called England, Dominion of Wales, and Town of Berwick-
upon-Tweed, in such manner as to him, the said John Joad, his executors,
administrators, and assigns, or any of them, should in his or their discretions
seem meet, and that ho, the said John Joad, his exors, admors, and assigns,
should have and enjoy the whole benefit and advantage arising by reason
of the said Invention, to have, hold, exercise, and enjoy the said licence,
powers, privileges, and advantages therein-before granted unto the said John
Joad, is exors, admors, and assigns, for the term of fourteen years from the
date of the said Letters Patent, and immediately ensuing; and in which
said Letters Patent there is contained, amongst other things, a certain provisoe
or requisition that if the said John Joad should not particularly describe
and ascertain the nature of his said Invention, and in what manner the
same was to be performed, by an instrument in writing under his hand and
seal, and cause the same to be inrolled in the High Court of Chancery within
four calendar months next and immediately after the date of the said Letters
Patent, that then the said Letters Patent, and all liberties and advantages
whatsoever thereby granted, should utterly cease and determine, as by the
said Letters Patent, relation being thereunto had, will appear.
NOW KNOW YE, that in pursuance of and obedience to the said Letters
Patent, and the directions or requisitions therein contained with respect to
the Specification of the secret or Invention aforesaid, the said John Jond hath
specified and declared, and doth hereby specify and declare, that the mill or
engine invented by the said John Joad, and which hath been the subject of
the Letters Patent above recited, is intended to be wrought or put in motion

page_text: by the means of fire, water, wind, or horses, as it shall be found most conve
nient in this respect; from which power so obtained motion will be given to n
certain horizontal spur wheel, to the shaft of which is fixed a crank, to which
crank is fixed a bar, and the said crank being turned, the bar being properly
guided, receives an oscitant motion; or from tho said spur wheel a perpen-
dicular rotative motion may be given to roller having a grove in a diagonal
direction round its circumference, in which grove is contained a wheel, the
spindle of which is fixed to a barr, which is supported by a piece of wood or
iron lying laterrally, and in a parralled direction with the said roller; the said
apparatus so placed, and the roller moving as aforesaid, gives also oscitant
motion to the said barr, the other end of which is fixed to another barr, either
with or without a spring, at the end of which is intended to ease the motion
swinging on a center from the spur wheel, to which the crank is fixed
a motion is given to another spar wheel, the shaft of which is perpendicular to
and directly over the centor of the swing bar; near the bottom of the shaft in
a male screw, on which is a wheel; in its centre, a female screw, and each end of
the male screw are two iron arms, and on the upper and under side of the said
wheel are two springs, the end of which is returned perpendicular, and as the
wheel on the male screw is turned backwards and forwards, the whole having
a duplex relative motion, as herein-after described, the female screw wheel
rises or falls, the two springs finding a boarding on the extream of the iron.
arms. On the other end of swing bar is a. horizontal wheel, the shaft of which
descends into the grinding box, which is similar to that in common use; and to
pat the grinding box into motion a line or chain is conveyed from the female
screw wheel round the said box wheel. The grinding blench, and method of
uniting the box to the running slate is similar to those in common use; and
in order to supply the glasses with sand to grind them a hopper is placed over
the centre of the swing box, or where a convenience may suit, from the
bottom of which a pipe is conveyed through the said swing bar into a circular
trough on the top of the box. The duplex rotative motion is obtained in the
following manner:-A motion is given to a horizontal wheel, on the shaft of
which are two broad wheels working into a spur and counter wheel diametri-
cally opposite to each other, the end of which shaft is lodged in a laver,
swinging centrally, with weights, and supported at each end by two hanging
pieces of iron under the laver, and paralel thereto is another laver to which
a balance is fixed, on the side of which are two eyes or forks, through which
are conveyed a rope or chain round a wheel on the axis of the spur and centor
wheel, to which a weight is appendant, which ascending and descending
alternately raises or depresses the under laver, the ends of which discharge

page_text: the swinging pieces of iron which alternately discharge the upper laver,
which raises or depresses the axis of the spur and centre wheel, and
gives it the duplex motion aforesaid. And that the polishing part of the
said mill or machine is constructed in the following manner, that is to say:-
A motion is given to a certain horizontal spur wheel, which turns a per-
pendicular spur wheel, to the axis of which is fixed a crank; or the horizontal
spur wheel may turn a roller similar to that used in the grinding part; which
crank or roller gives an oscillant motion to a certain bar, to which is affixed
the polishing clock, under which the glass is laid on a bottom stone, as in the
common method, which stone is supported by a frame bearing contrally on
another frame, which is supported by two trussels or frames for the conveniency
of shifting. In order to give the upper frame an oscillant curved motion or par-
ralel perpendicular laver is hung to the trussell or frame, the upper end of
which is fastened to the frame supporting the bottom stone, and that to the
bottom of the said laver another laver is applied, which swings horizontally on
a centre, the other end of which is applied to a roller, the same as in grinding;
or a horizontal crank, which said crank or roller having a spur wheel on its axis,.
is turned by the wheel on the axis of the first crank. And that the machino
for sifting sand is as follows:-A certain trough is partitioned or divided into
four parts, over three of which are three lines which have one common axis
supported at each end of a trough, the one end of which leading into the
first sive a hollow tube, into which tube a pipe is conveyed from the bottom
of a hopper placed at a convenient distance for the holding the sand. To give
the said sives a rotative motion, a wheel is fixed to the round part of
the axis, and united with the other work.
And that the above is and contains a full, accurate, and compleat descrip-
tion and discovery of the said mill or machine, and of all the secrets of
the Invention belonging to the same.
In witness whereof, the said John Joad hath hereunto set his hand and
seal, this Tenth day of January, in the twenty-third year of the
reign of His Majesty King George the Third, and in the year of
our Lord One thousand seven hundred and eighty-three.

page_text: AND BE IT REMEMBERED, that on the Tenth day of January, in
the year of our Lord 1788, the aforesaid John Joad came before our said
Lord the King in His Chancery, and acknowledged the Specification aforesaid,
and all and every thing therein contained and specified, in form above written.
And also the Specification aforesaid was stampt according to the tenor of the
Statutes made in the sixth year of the reign of the late King and Queen W™
and Mary of England, and so forth, and in the seventeenth year of the reign
of His Majesty King George the Third.
Inrolled the Tenth day of January, in the year of our Lord One thousand
seven hundred and eighty-three.