CERTAIN IMPROVEMENTS IN MACHINERY FOR GRINDING, SMOOTHING, AND POLISHING PLATE AND OTHER GLASS FOR LOOKING GLASSES, MIRRORS, AND VARIOUS OTHER ARTICLES, AND WHICH MACHINERY CAN ALSO BE APPLIED TO OTHER USEFUL PURPOSES
Year: 1808

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
NATHANIEL POLLARD, late of Queen Street, in the Parish of Saint John,
Southwark, in the County of Surrey, but now of the Parish of Saint James;
Clerkenwell, in the County of Middlesex, Lapidary, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by His
Letters Patent under the Great Seal of the United Kingdom of Great Britain
and Ireland, bearing date at Westminster, the Fourteenth day of March, in
the forty-eighth year of His reign, give and grant unto me, the said George
Nathaniel Pollard, my executors, admors, and assigns, His especial licence, full
power, sole privilege and authority, that I, the said George Nathaniel Pollard,
my exors, adñiors, and assigns, during the term of years therein expressed,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and the Town of Berwick-upon-Tweed, my Invention of "CERTAIN
IMPROVEMENTS IN MACHINERY FOR GRINDING, SMOOTHING, AND POLISHING PLATE
AND OTHER GLASS FOR LOOKING GLASSES, MIRRORS, AND VARIOUS OTHER ARTICLES,
AND WHICH MACHINERY CAN ALSO BE APPLIED TO OTHER USEFUL PURPOSES;"
in which said Letters Patent there is contained a proviso obliging me, the
said George Nathaniel Pollard, by an instrument in writing under my band
and seal, to cause a particular description of the nature of my said Invention,
and in what manner the same is to be performed, to be inrolled in His
Majesty's High Court of Chancery within two calendar months after the
date of the said recited Letters Patent, as in and by the same, relation
being thereunto had, will more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Georgo Nathaniel Pollard, do hereby declare that my said Invention is
particularly described and ascertained in and by the Drawings and references
thereto hereunto annexed.
In witness whereof, I, the said George Nathaniel Pollard, have hereunto
set my hand and seal, this Fourteenth day of May, in the year of our
Lord One thousand eight hundred and eight.
GEORGE NATHN POLLARD. (L.S.)
AND BE IT REMEMBERED, that on the Fourteenth day of May, in
the year of our Lord 1808, the aforesaid George Nathaniel Pollard 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 Statute made for that purpose.
Inrolled the Fourteenth day of May, in the year of our Lord One
thousand eight hundred and eight.

page_text: AAAA. the wood frame of the Mill. B the two table
beds upon which the Glases are Beded as C.D. the two
moving Cranks. E the middle Crank which receives
its Motion from the wheels. F which puts the two
Cranks D. into motion by means of the iron connecting
Bar G. Being fixed to the three Crank heads as at H
I.a round pin fixed to the Connecting Bar G. J. the-
Grinding Box with an iron collar on the centre of the
Back with a round hole on the inside of it with a
front plate to take off and put on by the means of
for a
two staples pin to goe through as at K. so that when
the front plate is off the Collar it can be placed to
the round Ipin I. in the connecting Bar G. so that
when the connecting Bar G. is put into motion by
the Cranks, the Grinding Boxes I will be in motion
at the same time and as the Crank heads can be
moved to a greater or lesser distance so will the Grind
ing Boxes J. traverse the surface of the table beds.
B. By which means the Glass Beded upon
the two
table Beds B and upon the Grinding Boxes J. will
be Ground to the most Level surface possible with the
use of sand and water as is commonly used.

page_text: moving cranks which receive their motions from the four
bevel or face wheels E which motion of the Cranks D puts the wood bar F. and
the eight small bevil wheels & upon the top of the wood bar Falso into motion th
bar F when in motion traverses over the two table beds B. and by which means
the I small bevil wheels & on the top of the wood Bar F. is also put into motion
and which puts into motion the two square pins I in the horizontal wheel at
each end of the Bar F. I The two Grinding Boxes with an iron collar as at J. on
the centre of the back of the Grinding Boxes I with a square hole in the inside of
it with a front plate to take of and put on by the means of the two staples for af
pin to go through as at I. So that when the front plate of the Collars and Boxes I
are placed to the two square pins as at II. and when the front plates are pined
at M. so that the two cranks are put into motion by the wheels E the Bar F. is
traversing over the two table beds B. and the eight bevil wheels G. on the top of the bar F. are
also in motion which immediately put in motion the two square pins I by which
means the two gunding boxes I will make four
more revolutions as
be required to once of the Bar F. & as the crank heads can be moved to a
may
or as
many
a
F
on d
greater or lesser distance so will the grinding boxes traverse the surface of the two-
table Beds B. more or less by which means the Glass that is beded upon the Table
beds and upon the Grinding Boxes I will be ground to the most levil surface_
possible.

page_text: Plate 1 and 2 specify my Mill for Grinding and Smoothing of Concair and Convex Mirror Glasses.
A.A.A. A. the wood frame of the Mill B. The eight iron bevil or spur wheels in plate 1... C. The eight iron spindles placed in the eight wheels. B. There
spindles have square tops to receive the iron socket C in plate 1. that is screwed to the back of the concave blocks D. plate 1. and upon which blocks the
concave mirror glases are Beded and which blocks and spindles receive their motion from the eight wheels B. E the eight convex blocks upon which the
a square hole in
Convex mirrors
are beded. I plate 1. a square iron pin fixed in the centre on the back of the convex blocks E which pin passes through
the middle of the lever G. plate 2. I. a small hole through the top of the pin F above the top of the lever G. plate 2. for a small pin to pass through
plate!
T
means
1
which
•Emery with that
2 to prevent the convex blocks E from falling when the lever & is lifted up which rises the convex blocks E. from the concave blocks D. at the time
the sand and water to work the Glasses are placed upon the concave mirror glases that are beded upon the concave blocks D the levers & is then let down by
the convex blocks E with the convex Mirror Glases Beded on them are placed upon the concave blocks D. By which method the convex and concave mirror
Glases are ground and smoothed the only difference between the guinding and the smoothing is vist to grind the glass sand is used and to smooth the glass variou
fine courses of emery
are used and lesser speed in the motion of the glass. By the wheels B as is hereafter specified I plate & the small wheel is placed upon the
cranks spindle . Q to give the speed to the four wheels. B. K. the large driving wheel which gives the motion to the wheel J. the smoothing - the concave and
convex mirror glases is performed by the same action as in the Grinding the same as above specified except that the wheels receive a slower motion by the means of the wheel
Glases
Is
are worked by the
It plate 1 which is fixed on the Crank spindle Q which drives the four other wheels B by which means the concave and convex
fixed
huth and ease requied. N. plate 1st 2nd the Runner made either of wood or iron with an iron chace mortice in it as at 0. plate 2 for the brass roller P. which is,
on the top of the Crank Q to work in _ X the moving crank whose throw can be lengthened or shortened by turning the nut S. By which means the crank head can be placed
pin at each end of the
backward or forward and by which the convex blocks El receive a longer or shorter motion I the four guiding rods one end of each is placed
runner N. with notches to receive the levers C as at V plate 2- by which means the levers Go and the convex blocks. I receive their motion from the Crank spindle Q and the runner V.
V.
the levers C are kept from being loose when lifted upp.
V. the iron bar which receives the end of the levers G. which have a round hole in the end to pass on the bar V. by which
from the notches in the Guide Rods T. W. the ketch boxes placed on the spindles C. over the wheels B. X. the forked levers that rise the ketch boxes W. which stop the spindles
C with the concave blocks I from moving when at any time the workmon want to examine the mirror Glases which are beded on the Concave and convex blocks D and P .
Plate 3. 1. and 5. specify my mill for polishing the Convex and Concave Mirror Glases.
More
plate
means
1
on a
have
&quare
tops to receive
3. A.A.A.A. the wood frame of the mill. B the six iron bevel or spur wheels. I the vix iron spindles placed in the six wheels B these spindles
the iron sockets C. plate 5. which are screwd to the back of the of Concave and Convex Blocks D and E upon which blocks the concave and convex mirrors are beded which spinde
Cand Blocks D. and E. receive their motion from the wheels B they receiving their motion from the large driving wheel. K. F. the iron or wood runner with an iron chase mortice in it oes.
Go for the brass, roller which is fixed on the top of the crank spindle II. so worke in which crank spindle II and runner I receive their motion from wheel I which again receives ito
motion from the large driving wheel K. J. two iron bars each end of which is fixed to the runner F' with holes in them for the Rod II with female or male mandrils H
to be pined to as at NO. the concave
as at Q for the rods 11 to pass into and be justened i
• polishing blocks P. the convex poilshing bleeks which have brass or iron grove guides
by a small pin as at R.S. the wood pollers plate 5 for the other end of the rods Is to pas between for to keep the polishing Blocks Q & P. to work upon the Mirror Glases hue D
the female or male maundrils which one end of the rods Is passes into to that the polishing Blocks 0 and I can turn the rods. It according to the concavity or convexity of the Mirror
shortened by turning
the nut T. Plate 4 and setting the Crank head more forward or back
Glases upon the blocks D. and E. H. the moving crank spindle whose throw can be lengthened
or
-ward which work the Runner F. So that the polishing blocks O and P| Can have a longer or shorter stroke upon mirror Glasses
as at plate 4. V the ketch boxes placed upon the spindle
C
over
the wheels. B. V. the forked levers that raise the ketch Boxes. I which stops any one of the spindles C. with the concave and convex blocks D and Fi from moving when at anytime the
Workinen want to examine the mirrors Glases which are beded upon the blocks D and E. W. the four brass sheaves for the sides of the runner I to work ine.