CERTAIN IMPROVEMENTS IN THE TOOL OR INSTRUMENT CALLED THE GLAZIER'S. DIAMOND
Year: 1815

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSHUA
SHAW, of, Mary Street, Fitzroy Square, in the County of Middlesex, send.
greeting
WHEREAS His most Excellent Majesty King George the Third, by His
Royal Letters Patent under the Great Seal of Great Britain, bearing date at.
Westminster, the Fourteenth day of April, in the fifty-fifth year of His
reign, did give and grant unto me, the said Joshua Shaw, my exors, adñiors,
and assigns, His especial licence, full power, sole privilege and authority,
that I, tho said Joshua Shaw, may exors, adñiors, and assigns, during the
term of years therein axpressed, 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 THE TOOL OR INSTRUMENT CALLED THE
GLAZIER'S. DIAMOND;" in which said Letters Patent there is contained a proviso
that if I, the said Joshua Shaw, shall not particularly describe and ascertain
the nature of my said Invention, and in what manner the same is to be
performed, by an instrument in writing under my hand and scal, and cause
the same to be inrolled in His Majesty's High Court of Chancary within six
calendar months next and immediately after the date of, the said Letters
Patent, as by the said Letters Patent, relation being thereunto had, may
more fully appear.
NOW KNOW YE, that in compliance with tho said proviso, I, the said
Joshua Shaw, de hereby declare that the nature of my said Invention, and

page_text: the manner in which the same is to be performed, are particularly described
in manner following, that is to say :-
The nature of my said Invention, and the object of the same, is the produc-
tion, such as is herein and hereby described, of an instrument, tool, machine,
or apparatus, which effects more readily and in a superior manner the purposes
of the tool or instrument commonly known and understood by the name or
appellation of a glazier's cutting diamond; and I do declare that I do produce
the same by so constructing my said instrument, tool, machine, or apparatus,
that the upper part or handle thereof is allowed to move round in the lower
part or setting thereof on its own axis (by which I mean a line supposed to be
drawn through it in the direction of its length), and by priming the lower
part or setting thereof with a flat or guiding face or side, in order and to the
end that, the said flat or guiding face or side of the under part or setting
being in practice applied to the edge of a ruler or guide, the aforesaid motion
allowed to the upper part or handle of the instrument may relieve the operator
from the necessity of making the horizontal adjustment which, in using the
common glazier's diamond, is required to be made by the motion or position
of the hand, wrist, or arm, in order to obtain the best cut of the diamond.
And I do further declare that I do construct my said instrument, tool, machine,
or apparatus, according to the following description thereof, reference being
had therein to the annexed Drawings.
In all the several Figures of the annexed Drawings the same letters of
reference are set against and point. out the same parts respectively in the
different situations of the several Figures.
Figure 1 is a perspective view of my aforesaid Invention, in one of the most
convenient forms in which I make it. A, B, is the upper part of the handle.
C, a cylindrical, conical, tapering, or other suitably-figured ferril or mounting
of brass or any other suitable metal or material. D, a continuation of the
said ferril, of smaller diameter, in which latter is inserted or fixed a cylinder
pin or stem E, of steel or other suitable firm and hard material. On the lower
termination of the said pin or stem E is fitted and placed the box carriage or
piece F, at the lower edge of which is set and fixed the cutting diamond II.
The fitting of the piece F upon the cylinder or stem E I effect and perform
by turning or otherwise forming a cylindrical hole or cavity in the substance
of the said cylinder or stem E, and of sufficient diameter to admit the stem E
to turn freely on its own axis when is introduced.
Figure 2 is a geometrical view of the instrument, from the point A to the
diamond at H, having the side of the piece F facing the observer.

page_text: Figure 8 is a geometrical view of the same parts of the instrument, with the
edge of the piece F facing the observer.*
Figure 4 is a geometrical view of the before-mentioned ferril or ferrils
C and D, and the pin or stem E before its introduction to or when separated
from the piece F; in this Figure the situation of the cavity formed in the
piece F, for the purpose of fitting it on the stem E, is shewn by the dotted
lines e, e, c.
A groove or channel g is formed in the stem E, and when the
pieco F is placed upon the stem E a small screw K is screwed into the
groove without touching or bearing upon the lower surface thereof; the effect
of this is that the stem E, and all that part of the instrument which is fixed
to it, is allowed to turn on its axis as far round as the length of the groove
allows, because the extremity of the screw K acts as a stop at the extent of
the groove each way.
Figure 5 is a geometrical view of the piece F seperately seen; it is seen
edgewise, as in Fig. 3, and shewing the perforation for the before-mentioned
screw K.
Figure 6 is a geometrical view of a section of the piece F, made through it
in the direction shown by the dotted line Q, Q, in Figure 3. L, m, shews the
cavity made for the reception of the stem E, Figure 4; and K is the screw
before mentioned, here shewn taken out of its place.
I further declare that I do apply my said Invention to practice for the
purpose of cutting glass, by applying the flat or guiding side or face of the
piece F to the edge of a ruler or mould, making such horizontal adjustment
as may be required to draw the instrument along the edge of the said ruler
or mould by the motion which the handle A, B, and the upper part of the
instrument has in the piece F. I also further declare that I either make my
aforesaid instrument to receive its motion about its own axis, as before
described, by making the whole upper or handle part of the instrument from
the.stem E, inclusive of the same, turn in the cavity of the piece F; or I.
make the handle A, B, to turn on its own axis in the ferril or mounting C;
.but in practice I find and determine the arrangement herein first described to
be the best and most effectual in use, and the most perfect and convenient of
construction.
In witness whereof, I, the said Joshua Shaw, have hereunto set my
hand and seal, this Tenth day of October, in the year of our Lord
One thousand eight hundred and fifteen.
JOSHUA (L.B.) SHAW.

page_text: AND BE IT REMEMBERED, that on the Tenth day of October, in the
year of our Lord 1815, the aforesaid Joshua Shaw 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 in that case made and provided..
Inrolled the Thirteenth day of October, in the year of our Lord One
thousand eight hundred and fifteen.