IMPROVEMENTS IN SLIVER CANS
Year: 1873

page_text: LETTERS PATENT to William Calvert, of Leeds, in the County
York, for the Invention of "IMPROVEMENTS IN SLIVER CANS."
Scaled the 10th March 1874, and dated the 11th September 1873.
PROVISIONAL SPECIFICATION left by the said William Calvert at
the Office of the Commissioners of Patents, with his Petition, on
the 11th September 1873.
I, WILLIAM CALVERT, of Leeds, in the County of York, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN SLIVER
CANS," to be as follows:-
The object of my Invention is to produce a sliver can much lighter,
stronger, more durable and cheaper than those of ordinary construction
employed in preparing wool, cotton, silk, flax, and other fibrous
substances, and is as hereafter described.
I provide two hoops in forming the bottom of the can, one within the
other. The edge of the piece forming the bottom is bent up and passed

page_text: between the two hoops, the bottom end of the body of the can and the
binder are also passed between. This being done they are all secured
firmly together, and afterwards turned to a face at the bottom edge so as
to ensure the can running perfectly level in the coiler or carrier on to
which it is placed when working. The top of the can also is firmly
secured between two hoops.
The can is first entirely formed of block iron. When the formation is
completed it passes through an ordinary pickling process for the purpose
of removing the scale. This process being completed it is prepared for
receiving a covering of tin, zinc, or lead, by means of a preparation of
salts or other known ingredients, and then dipped in a bath of molten
lead, zinc, or tin, whereby it is coated all over in one mass. This
process being completed the can is ready for usc.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Calvert in the Great Seal Patent Office
on the 10th March 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CALVERT, of Leeds, in the County of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of September, in the year a
of our Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Calvert, Her special licence
that I, the said William Calvert, my executors, administrators, and
assigns, or such others as I, the said William Calvert, 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
JN SLIVER CANS," upon the condition (amongst others) that I, the said
William Calvert, 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,

page_text: 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 William Calvert, 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 accom-
panying Drawings and to the letters of reference marked thereon, that
is to say:-.
The object of my Invention is to produce a sliver can much lighter,
stronger, more durable and cheaper than those of ordinary construction
employed in preparing wool, cotton, silk, flax, and other fibrous
substances and is as hereafter described.
In order that my said Invention may be fully understood and readily
carried into effect, I will proceed to describe the same with reference to
the accompanying Drawings.
Fig. 1 is a cross section of can; Fig. 2, an elevation; Fig. 3, a plan
looking at the top, and Fig. 4, a plan looking at the bottom.
of the body of
This being done
I provide two hoops a and b in forming the bottom of the can one
within the other as shewn. The edge c of the piece d is bent and
passed between the two hoops a and b. The bottom end
the can e, and the binder f are also passed between.
they are all turned to a face at the bottom edge g, so as
can running perfectly level in the "coiler" or " carrier " on to which it
is placed when in use. The top of the can is firmly secured between
the hoops and i. The top of the can is passed between the two
hoops h and i, as shewn, and fixed in that position.
to ensure the
The can by preference is formed of black iron. When the formation
is completed it passes through an ordinary "pickling" process for the
-purpose of removing the scale from the iron. When preferred the can
may be dipped previous to putting the bottom a in. This process being
completed it is prepared for receiving a covering of zinc or lead by
means of a preparation of salt or other known ingredients, and then
dipped into a bath of molten lead, zinc, or tin, whereby it is coated all
over in one mass, combining at the same time all the parts firmly
together. This process being completed the can is ready for use.

page_text: All parts of the can not herein described are of ordinary construction.
Having now described the nature of my said Invention and the
manner in which the same may be performed, I do not limit myself to
the exact limits, details, and configuration of parts explained and
shewn, but I claim and desire to secure by Letters Patent,-
Firstly. The general arrangement, construction, and application of
the rings a, b, h, i, and bottom d, also the binder f in combination with
other parts forming the sliver can, substantially as and for purposes
herein set forth.
Secondly. The application of the process of covering the cans with
zinc, lead, or tin, after, the formation is completed, with or without the
bottom d, substantially as and for purposes herein set forth.
In witness whereof, I, the said William Calvert, have hereunto
set my hand and seal, this Ninth day of March, in the year of
our Lord One thousand eight hundred and seventy-four.