IMPROVEMENTS IN JOINING TOGETHER ARMOUR AND OTHER THICK METAL PLATES, BEAMS, AND
Year: 1862

page_text: LETTERS PATENT to James Wright, of 42, Bridge Street Blackfriars,
City of London, Civil Engineer, for the Invention of "IMPROVEMENTS
IN JOINING TOGETHER ARMOUR AND OTHER THICK METAL PLATES, BEAMS, AND
Sealed the 3rd October 1862, and dated the 8th April 1862.
PROVISIONAL SPECIFICATION left by the said James Wright at the Office
of the Commissioners of Patents, with his Petition, on the 8th April
1862.
I, JAMES WRIGHT, of 42, Bridge Street Blackfriars, City of London, Civil
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN JOINING TOGETHER ARMOUR AND OTHER THICK METAL PLATES, BEAMS, AND:
GIRDERS," to be as follows, that is to say:-
I slot, plane, or in any convenient way make one or more "dovetails" in
the materials to be operated upon, the oblique sides of which are also oblique
to the surface, that is to say, the two opposite sides of each dovetail are to be
oblique to the end or side, and also oblique to the two surfaces of the plate
girder or beam. This obliquity of the sides of the dovetails to the surfaces is a
little more in one plate or half beam or half girder than in the other, so as to
permit of a taper key to be forced or driven in between those two pairs of
oblique sides of the dovetail, and thus by means of these keys draw and bind
the plates or component parts of the beam or girder together; in beams the
obliquity might be dispensed with, and rivets or screws used to form the
dovetail.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Wright in the Great Seal Patent Office on the
8th October 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
WRIGHT, of 42, Bridge Street, Blackfriars, City of London, Civil Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the. Eighth day of April, in the year of our Lord One
thousand eight hundred and sixty-two, in the twenty-fifth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
James Wright, Her special licence, that I, the said James. Wright, my
executors, administrators, and assigns, or such others as I, the said James
Wright, my 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, 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
JOINING TOGETHER ARMOUR AND OTHER THICK METAL PLATES, BEAMS, AND GIRDERS,"
upon the condition (amongst others) that I, the said James Wright, 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 per-
formed, 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 James Wright, 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-
I slot, plane, or in any convenient way make one or more "dovetails" in
the materials to be. operated upon, the oblique sides of which are also oblique
to the surface, that is. to say, the two opposite sides of each dovetail are to be
oblique to the end or side, and also oblique to the two surfaces of the plate
girder or beam. This obliquity of the sides of the dovetails to the surfaces is
a little more in one plate or half beam or half girder than in the other, so. as
to permit of a taper key to be forced or driven in between those two. pairs of
oblique sides of the dovetail, and thus by means of three keys draw and bind
the plates or component parts of the beam or girder together. In beams

page_text: the obliquity might be dispensed with, and rivets or screw used to form the
dovetail.
Having now described the nature of my Invention, and how the same is
formed and combined, I wish it understood that I claim as new, and desire
secured by the before in part recited Letters Patent, is the method of joining
together armour and other thick metal plates, beams, and girders substantially
as herewithin described and set forth.
In witness whereof, I, the said James Wright, have hereunto set my
hand and seal, this Eighth day of October, One thousand eight
hundred and sixty-two.
JAMES WRIGHT. (L.S.).