IMPROVEMENTS IN Cutting, DRESSING, 2 " AND MOULDING MARBLE, STONE, AND SLATE.
Year: 1874

page_text: LETTERS PATENT to William Thompson, of No. 5, Chestnut Walk,
Stratford-upon-Avon, in the County of Warwick, Architect and
Surveyor, for the Invention of "IMPROVEMENTS IN Cutting, DRESSING,
2
"
AND
MOULDING MARBLE, STONE,
AND
SLATE.
"
PROVISIONAL SPECIFICATION left by the said William Thompson
at the Office of the Commissioners of Patents, with his Petition,
on the 22nd January 1874.
I, WILLIAM THOMPSON, of No. 5, Chestnut Walk, Stratford-upon-
Avon, in the County of Warwick, Architect and Surveyor, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN CUTTING,
DRESSING, AND MOULDING MARBLE, STONE, AND SLATE," to be as follows:-
In the Specification of a former Patent granted to me on the 20th
day of October 1871, (No. 2802) was described an improved method of
cutting and moulding marble, stone, and slate. In using this method
I have found the sharp arises or cutting edges of the saws or moulding
cutters apt to get damaged or broken from the brittleness of the cement.

page_text: or composition I have been able to use in combination with the cutting
substances employed.
According to this my present Invention for an improved method of
cutting and moulding marble, stone, and slate, I use corundum, emery,
or other such like hard mineral cutting substances secured to or fixed in
holders made of steel or other suitable material.
For cutting blocks of marble, stone, or slate into slabs or other forms
I use straight blades of steel or iron, the edges of which are made to
receive the holders above described, and to which a reciprocating motion
may be given.
I also use discs of iron or steel having their edges made to receive
the holders, and which may be mounted on an axis or spindle.
For moulding or otherwise surfacing stone and such like substances, I
use a metal block approximating to the counterpart of the moulding or
surface to be produced. In the metal block holes are made to receive
the holders, spirally or otherwise, in its surface, the block having a hole
through its centre can be mounted on an axis or spindle and used in any
convenient manner.
For rubbing the surface of stone and other like substances, I use discs
having holes on their faces or sides to receive the holders which may be
mounted on an axis or spindle; or I use a plate of metal having holes
in its face to receive the holders to which a reciprocating motion may
be given.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Thompson in the Great Scal Patent Office 2
on the 21st July 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
THOMPSON, of No. 5, Chestnut Walk, Stratford-upon-Avon, in the
County of Warwick, Architect and Surveyor, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 3
Letters Patent, bearing date the Twenty-second day of January, in
the year of our Lord One thousand eight hundred and seventy-four,
in the thirty-seventh year of Her reign, did, for Herself, Her heirs.

page_text: and successors, give and grant unto me, the said William Thompson,
Her special licence that I, the said William Thompson, my executors,
administrators, and assigns, or such others as I, the said William
Thompson, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times there-
after, during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an In-
vention for "IMPROVEMENTS IN CUTTING, DRESSING, AND MOULDING MARBLE,
STONE, AND SLATE," upon the condition (amongst others) that I, the
said William Thompson, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Scal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said William Thompson, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement, that is to say:-
-
In the Specification of a former Patent granted to me on the 20th
day of October 1871 (No. 2802) was described an improved method for
cutting and moulding marble, stone, and slate. In using this method
I have found the sharp arrises or cutting edges of the saws and moulding
cutters apt to get damaged or broken from the brittleness of the cement
or composition I have been able to use in combination with the cutting
substances employed.
According to this my present Invention for an improved method of
cutting and moulding marble, stone, and slate, I use corundum, emery,
or other such like hard mineral cutting substances secured to or fixed in
holders made of steel or iron.
For cutting blocks of marble, stone, or slate into slabs or other forms
I use straight blades of steel or iron, the edges of which are made to
receive at suitable distances from cach other the holders above named,
and to which a reciprocating motion may be given,

page_text: I also use discs of steel or iron having their edges made to receive at
suitable distances apart the holders above named, and which may be
mounted on an axis or spindle.
For moulding or otherwise surfacing stone and such like substances
I use a metal block approximating to the counterpart of the moulding
or surface to be produced. In the metal block holes are made spirally
or otherwise around its surface to receive the holders formed of tubes,
hereafter described, the block having a hole through its centre can be
mounted on an axis or spindle in any convenient manner to suit tho
machinery to which it may be applied.
For rubbing the surfaces of stone and such like substances I use discs
having holes on their faces or sides to receive the holders, and which
may be mounted on an axis or spindle and used in any convenient
manner; or I use a plate of metal having holes on its face to receive tho
holders and to which a reciprocating motion may be given.
I make or prepare the straight blades and discs to receive the holders
as follows-Having selected a straight blade or disc of a suitable
strength and size for the purpose required I drill or punch holes
through them at their edges or circumference at short distances from
each other. I afterwards plane down the edges or blades and turn down
the circumference of discs in a lathe, so that the holders when inserted
in the holes will project beyond the edges of straight blades and circum-
ference of discs.
The holders I use in the straight blades and discs are made by punch-
ing discs out of steel or iron, and should be about half the thickness of
the straight blades or discs. I take two of these discs and having
drilled holes through them at their circumference and countersunk them
on their inner faces to receive the cutting substance, I secure the two
discs together by a screw to form the holder. To secure the holders in
the blades and discs I make a saw cut on each side of the holder and
corresponding ones in the blades or discs into which a thin wedge of
steel may be inserted.
When the cutting substance is worn the holders can be readily
taken from the blades or discs, and by removing the screw which
secures the discs together and forms the holder, a fresh cutting
substance can be inserted, care being taken that the cutting

page_text: or performing the same, I would have it understood, what I claim is,
First. Cutting, moulding, and working marble, stone, and slate in
manner herein-before described.
Secondly. Forming holders, as herein-before described, for securing
cutting substances used for cutting and working stone and such like
substances.
In witness whereof, I, the said William Thompson, have hereunto
set my hand and scal, this Twentieth day of July, One thousand
eight hundred and seventy-four.
WILLIAM THOMPSON. (L.S.)