IMPROVEMENTS IN THE MANUFACTURE OF BACK SAWS
Year: 1873

page_text: LETTERS PATENT to John Cartwright, of Sheffield, in the County of
York, Billiard Table Maker, for the Invention of "IMPROVEMENTS IN
THE MANUFACTURE OF BACK SAWS."
Sealed the 8th August 1873, and dated the 19th April 1873.
PROVISIONAL SPECIFICATION left by the said John Cartwright at the
Office of the Commissioners of Patents, with his Petition, on the
19th April 1873.
I, JOHN CARTWRIGHT, of Sheffield, in the County of York, Billiard
3 Table Maker, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE MANUFACTURE OF BACK Saws," (to be as follows) :-
This Invention refers to that class of saws known as "back saws,"
that is saws made with strengthening plates for giving greater stiffness
to the blade, and consists in forming the back of the saw, whether of
brass or any other metal or substance, of one or more solid pieces or
plates.

page_text: Above and over the bed plates a saw or other cutting tool is arranged,
and rectilinear motion is given either to the cutting instrument or to the
guides carrying the plates of metal, the cutting tool making the groove,
gate, or furrow in the plate, which is to stiffen and receive the blade of
the saw, which is then fixed therein by springing or otherwise.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said John Cartwright in the Great Seal Patent Office
on the 18th October 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
CARTWRIGHT, of Sheffield, in the County of York, Billiard Table Maker,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Nineteenth day of April, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said John Cartwright, Her special licence
that I, the said John Cartwright, my executors, administrators,
and assigns, or such others as I, the said John Cartwright, my
exccutors, administrators, and 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 Ircland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN THE MANUFACTURE OF BACK SAWS," upon the condition (amongst others)
that I, the said John Cartwright, 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 Seal Patent Office within six
calendar months next, and immediately after the date of the said Letters
Patent.

page_text: is to be performed, to be particularly described and ascertained in and
by the following statement, that is to say :-
This Invention relates to that class of saws known as "back saws,"
that is saws made with strengthening plates for giving greater stiffness
to the blade, and consists in forming the back of the saw, whether of
brass or other metal, of one or more solid pieces or plates, and then by
means of a saw or other cutting tool making a groove, gate, or furrow
on one or both edges of the saw back to hold the blade of the saw or
saws so as to form a double back saw if desired. The saw blade or
blades, as the case may be, is then fixed in the strengthening plate or
plates by springing or otherwise.
I find that this mode of manufacturing back saws is preferable to the
method heretofore in use of shaping the back and forming the gate or
furrow by bending or welding.
In producing the gate or furrow the necessary rectilincar motion is
obtained in any well known manner, and is imparted to the saw back or
to the cutting tool, or to both the saw back and cutting tool, as may be
most desirable.
Having thus described the nature of my said Invention, I claim
making the groove, gate, or furrow in the back of back saws with saws
or any other cutting tool suitable for the purpose, substantially as herein
described.
In witness whereof, I, the said John Cartwright, have hereunto
set my hand and scal, this Eighteenth day of October, in the
year of our Lord One thousand eight hundred and seventy-
threc.
JOHN CARTWRIGHT. (L.S.)