IMPROVEMENTS IN THE MODE OF FIXING ZINC PLATES IN LITHOGRAPHIC PRINTING MACHINES." PROVISIONAL SPECIFICATION
Year: 1875

page_text: LETTERS PATENT to William Goldsmith Borrett, Lithographer, of 6,
Castle Street, Holborn, and Thomas Hyde, Engineer, of 9, Kirby
Street, Hatton Garden, both in the County of Middlesex, for the
Invention of "IMPROVEMENTS IN THE MODE OF FIXING ZINC PLATES IN
LITHOGRAPHIC PRINTING MACHINES."
PROVISIONAL SPECIFICATION left by the said William Goldsmith
Borrett and Thomas Hyde at the Office of the Commissioners of
Patents, with their Petition, on the 25th October 1875.
We, WILLIAM GOLDSMITH BORRETT, Lithographer, of 6, Castle Street,
Holborn, and THOMAS HYDE, Engineer, of 9, Kirby Street, Hatton Garden,
both in the County of Middlesex, do hereby declare the nature of the
said Invention for " IMPROVEMENTS IN THE MODE OF FIXING ZINC PLATES IN
TDM" to be as follows.

page_text: lithographic printing machines of a means of fixing zinc plates in order
to secure them as required for printing from. For this purpose our
Invention consists in the adaptation and application to such machines of
a table or bed plate of sufficient depth to take the place of an ordinary
lithographic stone for the zinc plate to rest upon, and forming in cither
two or three sides of such table slots with horizontal guides, in and on
which " dogs" (similar to those used in lathe chucks) may be caused to
slide inwards as nuts on horizontal screws turned from outside the table.
On either one or two sides of the table there are fixed "dogs" or holders,
against which either one or two sides of the plate can be pressed, and
the plate secured by the sliding inwards of the moveable "dogs" against
the remaining sides of the plate. Both the fixed "dogs" or holders and
the moveable "dogs" are formed at their outer edge with an under cut
bevil corresponding with the edge of the plate, which is intended to fit
therein, and the said outer edge is also sloped off from that part which
is flush with the surface of the plate, in order to be clear from the action
of the printing cylinder and rollers.
The stationary screws on which the moveable "dogs" are worked
abut at one end against the inner ends of the slots in the table, and at
the other end against a fixed outer plate, which is recessed to receive a
collar formed on the screw; and the "dogs" have fixed to them at the
bottom guide plates, by which they are prevented from rising above the
face of the table as they are slidden along the guides in the slots.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Goldsmith Borrett and Thomas Hyde 2
in the Great Scal Patent Office on the 15th February 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
GOLDSMITH BORRETT, Lithographer, of 6, Castle Street, Holborn, and
THOMAS HYDE, Engineer, of 9, Kirby Street, Hatton Garden, both in the
County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
9

page_text: year of our Lord One thousand eight hundred and seventy-five, in tho
thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto us, the said William Goldsmith Borrett
and Thomas Hyde, Her special licence that we, the said William
Goldsmith and Thomas Hyde, our executors, administrators, and
assigns, or such others as we, the said William Goldsmith and
Thomas Hyde, our executors, 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, usc, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN THE MODE OF FIXING ZINC
PLATES IN LITHOGRAPHIC PRINTING MACHINES," upon the condition (amongst
others) that we, the said William Goldsmith Borrett and Thomas
Hyde, our executors or administrators, by an instrument in writing
under our, or their, or one of their hands and scals, 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 we, tho said William Goldsmith Borrett and
Thomas Hyde, do hereby declare the nature of our 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 Drawings hereunto annexed and to the letters and
figures marked thereon (that is to say) :-
Our Invention of "Improvements in the Mode of Fixing Zinc Plates
in Lithographic Printing Machines" has for its object the adaptation
and application to lithographic printing machines of a means of fixing
zinc plates in order to secure them as required for printing from. For
this purpose our Invention consists in the adaptation and application to
such machines of a table or bed plate of sufficient depth to take the
place of an ordinary lithographic stone for the zinc plate to rest upon,
and forming in either two or three sides of such table slots with hori-
zontal guides, in and on which "dogs" (similar to those used in lathe
chucks) may be caused to slide inwards as nuts on horizontal screws

page_text: turned from outside the table. On cither one or two sides of the table
there are fixed "dogs" or holders, against which either one or two sides
of the plate can be pressed, and the plate secured by the sliding inwards
of the moveable "dogs" against the remaining sides of the plate; but
the fixed "dogs" or holders and the moveable "dogs" are formed at
their outer edge with an under cut bevil corresponding with the edge of
the plate which is intended to fit therein, and the said outer edge is also
sloped off from that part which is flush with the surface of the plate in
order to be clear from the action of the printing cylinder and rollers.
The stationary screws on which the moveable "dogs" are worked:
abut at one end against the inner ends of the slots in the table, and at
the other end against a fixed outer plate, which is recessed to receive a
collar formed on the scrow, and the "dogs" havo fixed at the bottom
guide plates, by which they are prevented from rising above the face of
the table as they are slidden along the guides in the slots.
Having thus stated the nature of the said Invention we will proceed
to describe more particularly in what manner the same is to be performed
by the aid of the accompanying Drawings, in which is represented the
means of fixing zinc plates in lithographic printing machines above
referred to.

page_text: with fixed or stationary and moveable " dogs" of the kind described for
holding zinc plates thereon for printing, as described.
In witness whereof, we, the said William Goldsmith Borrett and
Thomas Hyde, have hereunto set our hands and scals, the
Fifteenth day of February, in the year of our Lord One thousand 5
eight hundred and seventy-six.
Witness,
WILLIAM SPENCE,
8, Quality Court,
Chancery Lanc.
W. G. BORRETT. (L.S.)
(L.S.)
T. HYDE.