ANDOP'S DISCLAIMER AND MEMORANDUM.⚫ OF ALTERATION
Year: 1867

page_text: MUNRO AND DUNLOP'S DISCLAIMER AND MEMORANDUM
.⚫ OF ALTERATION..
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ARCHIBALD
MUNRO, of Arbroath, in the County of Forfar, North Britain, and
ANDREW DUNLOP, of Glasgow, in the County of Lanark, North Britain,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria by Her Royal
Letters Patent, bearing date the Twenty-second day of November, One
thousand eight hundred and sixty-seven, 'No. 3311, did, for. Herself, Her
heirs, and successors, give and grant unto me, the said Archibald Munro,
Her special license, that I, the said Archibald Munro, my executors,
administrators, and assigns, or such others, as I, the said Archibald
Munro, my executors, administrators, and assigns, should agree with
and no others, from time to time and at all times thereafter during the
time therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland,

page_text: the Channel Islands, and Isle of Man, an Invention of "AN IMPROVED
TOOL TO BE USED FOR CUTTING ROCKS OR STONE AND OTHER SIMILAR SUBSTANCES,"
upon the condition, amongst others, that I, the said Archibald Munro,
by an instrument in writing under my hand and seal, 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 Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent:
And whereas I, the said Archibald Munro, by an instrument in
writing, under my hand and seal, did declare the nature of the said
Invention, and in what manner the same was to be performed, and
caused the same to be filed in the Great Seal Patent Office on the
Twentieth day of May, One thousand eight hundred and sixty-eight:
And whereas by divers agreements in writing and assignments the
said Andrew Dunlop has acquired an interest in the said Letters
Patent:
or of iron
And whereas since filing the aforesaid Complete Specification we
have discovered that by a clerical error the title of the said Letters
Patent is incorrectly recited in the preamble of the said Complete
Specification, and also that in the said Complete Specification, and in
the claiming clause at the end thereof, reference is made to the employ-
ment of other compounds of iron, or of iron compounded with other
materials, whilst the said Specification does not describe the com-
position of the other compounds of iron, compounded with other
materials intended to be employed, and we are therefore advised that
the said Complete Specification may possibly be construed as being in
that respect too vague and indefinite, and that the validity of the said
Letters Patent is thereby endangered. We are therefore desirous of
amending the clerical error in the recital of the said Letters Patent
contained in the preamble of the said Specification, and of disclaiming
parts of the claiming clause, and otherwise of altering the said Complete
as lierein-after set forth
Specification.
A
NOW KNOW YE, that we, the said Archibald Munro and Andrew
Dunlop, by and with the leave of Her Majesty's Attorney General, and
for the reasons aforesaid, do alter the said Specification by striking out of
the preamble or recital of the said Letters Patent, in the said Specification,

page_text: and in the means employed therefor;
on the second page of the print of the said Specification, printed by tho
Qucen's Printers, and published at the Great Seal Patent Office, in the year
One thousand eight hundred and sixty-cight, the words "Improvements
in Boring and Cutting Rocks or Stone, and other Similar Substances," in
the twenty-third, twenty-fourth, and twenty-fifth lines of the said
second page,
, and inserting in lieu thereof the words "An Improved Tool
to be Used for Cutting Rocks or Stone and other Similar Substances."
Also by striking out of the fourth and fifth lines of page three of the
said Specification the words, "or iron compounded with other sub-
stances;" also by striking out the words "or other compound of iron,"
Bro
^
ald
being the first words of the twenty-sixth line of the third page;
also by striking out of the first line of the claiming clause, being
line thirty-six of the fourth page of the said Specification, the words
"chilled cast," occuring between the words "of" and "iron;" and the
words "or iron compounded with other material and" occuring after
the word "iron" in the lines thirty-sixth and thirty-seven of the said
page four.
And in order that the effect of the said Disclaimer and Memorandum
of Alteration may be better understood I annox hereto a copy of the
said Specification and preamble as it will appear when so altered and
amended, the testing clause being omitted.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of November, in
the year of our Lord One thousand eight hundred and sixty-seven, in
the thirty-first year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Archibald Munro, Her
special license, that I, the said Archibald Munro, my executors, admi-
nistrators, and assigns, or such others as I, the said Archibald Munro,
executors, administrators, or assigns, should at any time agree
with, and no others, from time to time and at all times thereafter
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 Invention for
"AN IMPROVED TOOL TO BE USED FOR CUTTING ROCKS OR STONE AND OTHER
SIMILAR SUBSTANCES," upon the condition (amongst others) that I, the
said Archibald Munro, by an instrument in writing under my hand

page_text: and seal, 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 Seal Patent Office within six
calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Archibald Munro, 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, reference being had to the accompanying Drawings,
and to the letters and figures marked thereon:-
My said Invention especially relates to an improved tool to be used
for cutting rocks or other similar substances in mining and engineering
operations, and in hewing or cutting stone for building and other
structural purposes, and it consists in the application of chilled cast-iron
as the material of which the tools themselves are made.
The tool consists of flat discs with the edge bevilled or of a bell-
mouth shape, so that a sharp or cutting side is left all round them. The
tools are retained in holders fixed to the boring head of a boring or
cutting machine, and they are manufactured by running cast iron into
properly shaped chills in the ordinary manner.
In place of forming the tools of a disc shape they may be made
oblong, with round or semicircular ends, elliptical, angular, or other
form, and a dovetailed or other shaped projection is formed on the back
for retaining them in the holders.
And in order that my said Invention may be properly understood I
now proceed more particularly to set forth the system, mode, or manner
in or under which the same is or may be used or practically carried into
effect, reference being had, for the sake of more complete elucidation,
to the letters and figures upon the explanatory Sheet of Drawings which
I have hereunto appended, that is to say :-
Figure 1 is a transverse section on the line a, b, Figure 3, of the
mould in which the chilled cast-iron cutting tools are cast; Figure 2, a
longitudinal section on the line c, d, Figure 3; and Figure 3, a plan of
the same.
· The mould is constructed of two parts or cheeks A. B. the under side:

page_text: cach of
of which is checked or grooved to receive the steel plate C, which
is bolted to the chicck B, and forms the sole of the several cavities D,
into which the molten cast-iron is poured through the runner or
gait hole c. The two cheeks are hinged together at E, Figures 2
and 3, and when the mould is prepared for receiving the molten metal
the cheeks are held together by the pinching screws F, Figure 1, and
after the metal has been run into the chills by releasing the screw F the
tools and gait are taken out as one casting, the tools being held to the
gait by the extremity of the narrow strip of metal which forms the pro-
jection at the back of each.
Figures 4, 5, 6, 7, 8, 9 are the respective plans and elevations of three
forms of chilled cast-iron cutters, but the shape may be varied according
to what is found most suitable for the different kinds of stone, marble,
slate, or other material operated upon. V shaped projections a are
formed on the back of the cutters, which fit into corresponding grooves
in the tool holder.
'
Figure 10 is a side clevation, and Figure 11 an edge view of the tool
holder, in which a cutter, similar to that shown on the detached views,
a is the socket end of
Figures 6 and 7, is represented as being held.
the holder, by which it is fixed into the revolving disc or cutter head
of the rock cutting machine. V shaped grooves baro formed on the
edge of the socket, which fit into corresponding projections in recesses
.tho
837
formed round the edge of, disc or cutter head, into which the holders
are fitted. The end c into which the cutter is placed is checked out in
front, and a V shaped groove his cut in the edge, shown dotted at
Figure 10, into which the projection on the back of the cutter fits. The
cutter is held in by a clamp picce d fastened by a pinching screw e;
a steady pin is also formed on the side which fits into the edge of the
holder, as shewn at f, Figure 10, and so prevents the clamp piece from
turning or shifting.
It is obvious that besides being used in conjunction with the holders,
herein-before set forth and shown on the annexed Sheet of Drawings,
the tools may be held in any form of holders, and may be made to suit
any form of holder.
Figure 12 is a section, and Figure 13 a plan of a tool having the face
and edge formed slightly concave, by which means a finer cutting edge

page_text: is obtained. The projection by which it is held in the tool holder is
circular, as shown at a, Figures 12 and 13.
Figure 14 is a plan of a tool on which the projection 6 is formed
rectangular. The face and edge of the tool may have the same con-
figuration as shewn on Figures 7 or 12.
'
Figure 15 is a plan of a rectangular tool, and Figure 16 a side elevation
of the same, having the face and edge formed concave, as shown at c,
and tho projection D on the back rectangular.
Owing to the form of the tools it is obvious that when once either
edge is worn down, by merely taking the tool out of the holder and
reversing the tool another cutting edge is brought into operation, and
after both cutting edges are worn down the tool may be remelted, and
being cast again into the chills are converted into new tools; thus, the
waste of material is reduced to a minimum.
A great saving of labour is also effected by casting the tools into a
chill, as there is no necessity for grinding the edges, the tools being
ready for use as soon as they are cool and fit to be removed from the
mould.
Having now described the nature of my said Invention, and the
manner in or under which the same is or may be used or practically
carried into effect, I would observe in conclusion that what I consider
novel and original, and therefore claim as the Invention secured to me
by the herein-before in part recited Letters Patent is, the application of
iron cast in chills for constructing tools to be used in the cutting or
hewing of stone, marble, slate, or other rocks or similar materials; also
in the use of an angular or other shaped pieco cast on the back of each
tool for enabling the same to be firmly held in the tool holders, as
herein-before described and shewn in the accompanying Sheet of
Drawings.
housef
WA
the coid Awahibald Mun
and Andrew Dunlop, .--.
have hone
Drawings.
and Andrew Dunlop,
In witness whereef, we, the said Archibald Munro have here 30
unto set our hands and seals, this Sixteenth day of March, One
thousand eight hundred and seventy-six.

page_text: I hereby grant my fiat giving leave to the above-named Archibald
Munro and Andrew Dunlop to file in the Great Seal, Patent Office, with
the Specification to which the same relates, the above-written Disclaimer
5 and Memorandum of Alteration. Dated this Sixth day of April, One
thousand eigh hundred and seventy-six.
Temple.
JOHN HOLKER,
Attorney-General.

page_text: LETTERS PATENT to Archibald Munro, of Arbroath, in the County of
Forfar, North Britain, Engineer, for the Invention of "AN IMPROVED
TOOL TO BE USED FOR CUTTING ROCKS OR STONE AND
SUBSTANCES."
OTHER SIMILAR
Sealed the 19th May 1868, and dated the 22nd November 1867.
PROVISIONAL SPECIFICATION left by the said Archibald Munro at the
Office of the Commissioners of Patents, with his Petition, on the 22nd
November 1867.
I, ARCHIBALD MUNRO, of Arbroath, in the County of Forfar, North Britain,
Engineer, do hereby declare the nature of the said Invention of "AN IMPROVED
TOOL TO BE USED FOR CUTTING ROCKS OR STONE AND OTHER SIMILAR SUBSTANCES,"
to be as follows, that is to say:-
This Invention especially relates to an improved tool to be used for cutting
rocks or other similar substances in mining and engineering operations, and
in hewing or cutting stone for building and other structural purposes, and it
consists in the application of chilled cast iron as the material of which the
tools themselves are made. The tools consist of flat discs with the edge
bevilled so that a sharp or cutting side is left all round them, the tools are

page_text: retained in holders fixed to the boring head of a boring or cutting machine
and they are manufactured by running cast iron into properly shaped chills
in the ordinary manner. In place of forming the tools of a disc shape they
may be made oblong with round, or semicircular ends, elliptical, angular, or
other form, and a dovetailed or other shaped projection is formed on the back
for retaining them in the holders.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Archibald Munro in the Great Seal Patent Office on the
20th May 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARCHIBALD
MUNRO, of Arbroath, in the County of Forfar, North Britain, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-second day of November, in the year of our
Lord One thousand eight hundred and sixty-seven, in the thirty-first year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Archibald Munro, Her special license that I, the said Archibald
Munro, my executors, administrators, and assigns, or such others as I, the
said Archibald Munro, executors, administrators, or assigns, should at any
time agree with, and no others, from time to time and at all times thereafter
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 Invention for "IMPROVEMENTS IN BORING
AND CUTTING ROCKS AND OTHER SUBSTANCES, AND IN THE MEANS EMPLOYED THERE-
FOB," upon the condition (amongst others) that I, the said Archibald Munro,
by an instrument in writing under my hand and seal, 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
Seal Patent Office within six calendar months next and immediately after the
date of the said Letters Patent.\
NOW KNOW YE, that I, the said Archibald Munro, do hereby declare
the nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying Drawings and to the
letters and figures marked thereon :-

page_text: My said Invention especially relates to an improved tool to be used for
eutting rocks or other similar substances in mining and engineering operations,
and in hewing or cutting stone for building and other structural purposes,
and it consists in the application of chilled cast iron or iron compounded with
other substances, as the material of which the tools themselves are made.
The tool consists of flat discs with the edge bevilled or of a bell-mouth shape-
so that a sharp or cutting side is left all round them; the tools are retained
in holders fixed to the boring head of a boring or cutting machine, and they
are manufactured by running cast iron into properly shaped chills in the
ordinary manner. In place of forming the tools of a disc shape, they may
be made oblong with round or semicircular ends, elliptical, angular, or other
form, and a dovetailed or other shaped projection is formed on the back for
retaining them in the holders.
And in order that my said Invention may be properly understood I now
proceed more particularly to set forth the system, mode or manner in or
under which the same is or may be used or practically carried into effect,
reference being had for the sake of more complete elucidation to the letters
and Figures upon the explanatory Sheet of Drawings which I have hereunto
appended, that is to say:-
Figure 1 is a transverse section on the line a, b, Figure 3 of the mould
in which the chilled cast iron cutting tools are cast; Figure 2 a longitudinal
The mould
section on the line c, d, Figure 3, and Figure 3 a plan of the same.
is constructed of two parts or cheeks A, B, the under side of each of which is
checked or grooved to receive the steel plate C which is bolted to the check B
and forms the sole of the several cavities D, into which the molten cast iron
The
or other compound of iron is poured through the runner or gait hole c.
two cheeks are hinged together at E, Figures 2 and 3, and when the mould
is prepared for receiving the molten metal the cheeks are held together by
the pinching screws F, Figure 1, and after the metal has been run into the
chills by releasing the screw F, the tools and gait are taken out as one casting
the tools being held to the gait by the extremity of the narrow strip of
metal which forms the projection at the back of each. Figures. 4, 5, 6,
7, 8, 9 are the respective plans and elevations of three forms of chilled cast
iron cutters, but the shape may be varied according to what is found most
suitable for the different kinds of stone, marble, slate, or other material,
operated upon. V-shaped projections a are formed on the back of the cutters
which fit into corresponding grooves in the tool holder; Figure 10 is a side
elevation, and Figure 11 an edge view of the tool holder in which a cutter

page_text: similar to that shown on the detached views Figures 6 and 7 is represented
as being held. a is the socket end of the holder by which it is fixed into the
revolving disc or cutter head of the rock cutting machine, V-shaped grooves b
are formed on the edge of the socket, which fit into corresponding projections
in recesses formed round the edge of the disc or cutter head into which the
holders are fitted. The end c into which the cutter is placed is checked out
in front, and a V-shaped groove h is cut in the edge shown dotted at Figure 10
into which the projection on the back of the cutter fits. The cutter is held in
by a clamp pieced fastened by a pinching screw ; a steady pin is also formed
on the side which fits into the edge of the holder as shown at f, Figure 10, and
so prevents the clamp piece from turning or shifting. It is obvious that besides
being used in conjunction with the holders berein-before set forth and shown
on the annexed Sheet of Drawings the tools may be held in any form of holders,
and may be made to suit any form of holder; Figure 12 is a section, and
Figure 18 a plan of a tool having the face and edge formed slightly concave
by which means a finer cutting edge is obtained. The projection by which it is
held in the tool holder is circular as shown at a, Figures 12 and 13; Figure 14
is a plan of a tool on which the projection b is formed rectangular. The face
and edge of the tool may have the same configuration as shown on Figures 7
or 12; Figure 15 is a plan of a triangular tool, and Figure 16 a side elevation
of the same having the face and edge formed concave as shown at c, and the
projection D on the back rectangular. Owing to the form of the tools it is
obvious that when once either edge is worn down by merely taking the tool
out of the holder and reversing the tool, another cutting edge is brought into
operation, and after both outting edges are worn down the tool may be
remelted and being cast again into the chills are converted into new tools;
thus the waste of material is reduced to a minimum. A great saving of
Jabour is also effected by casting the tools into a chill as there is no necessity
for grinding the edges, the tools being ready for use as soon as they are cool
and fit to be removed from the mould.
Having now described the nature of my said Invention, and the manner
in or under which the same is or may be used or practically carried into
effect, I would observe in conclusion that what I consider novel and original
and therefore claim as the Invention secured to me by the herein-before in
part recited Letters Patent is,-
The application of chilled cast iron or iron compounded with other material
and cast in chills for constructing tools to be used in the cutting or hewing of
stone, marble, slate, or other rocks or similar materials, also in the use o

page_text: an angular, or other shaped piece cast on the back of each tool for
enabling the same to be firmly held in the tool holders as herein-before
described and shown in the accompanying Sheet of Drawings.
In witness whereof, I, the said Archibald Munro, have hereunto set my
hand and seal, this Eighteenth day of May, One thousand eight
hundred and sixty-eight,
Witness,
ST. JOHN VINCENT DAY,
Patent Office,
166, Buchanan Street,
Glasgow.
ARCHIBALD MUNRO. (L.B.)