THE PURPOSES OF WRITING AND DRAWING, CALLED 'THE WRITING AND DRAWING TUBE
Year: 1853

page_text: LETTERS PATENT to Edward Tasker, of South Hackney, in the
County of Middlesex, for an Invention for "THE PURPOSES OF
WRITING AND DRAWING, CALLED 'THE WRITING AND DRAWING TUBE.”
"
PROVISIONAL SPECIFICATION left by the said Edward Tasker
at the Office of the Commissioners of Patents, with his Petition,
on the 15th January 1853.
I, EDWARD TASKER, of South Hackney, in the County of Middlesex,
do hereby declare the nature of the said Invention of "AN INSTRU-
MENT CALLED THE WRITING AND DRAWING TUBE,'" to be as follows:-
A thin plate of metal is formed into a tube by bringing its two edges
nearly into contact. One end of the tube is gradually tapered, so as to
reduce the aperture of the tube at that end to the exact size of the
black-lead, slate, chalk, or other substances that may be used. The
tube will permit the substances used to run throughout its entire length
except about one quarter of an inch. Between the two edges of the
metal forming the tube there is made to slide a piece of metal, connect-

page_text: ing an embolus within the tube, and a piece of metal on the outside of
the tube, by means of which the aforesaid substances may be propelled
through the aperture at the tapered end of the tube as occasion may
require. The two edges of the metal forming the tube between which
the embolus is made to slide, pressing upon it with a sufficient force,
prevents the embolus or propeller from sliding back in the act of using
the tube, but allows it to be pushed at pleasure backward or forwards
by the finger.
What I claim as my Invention is the adaptation and arrangement of
a metallic tube in such a manner as to form an instrument capable of
containing throughout its entire length, except about one quarter of an
inch, black-lead, slate, chalk, or other substances, and of being used for
the nurnoses of writing and drawing.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Edward Tasker, in the Great Seal Patent Office,
on the 15th September 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
EDWARD TASKER, of South Hackney, in the County of Middlesex,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifteenth day of January, in the
year of our Lord One thousand eight hundred and fifty-three, in the
sixteenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Edward Tasker, Her special licence
that I, the said Edward Tasker, my executors, administrators, and
assigns, or such others as I, the said Edward Tasker, 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 "THE PURPOSES
OF WRITING AND DRAWING, CALLED THE WRITING AND DRAWING TUBE,

page_text: upon the condition (amongst others) that I, the said Edward Tasker, 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 Edward Tasker, 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:-
The object of this Invention is the construction of an instrument
capable of holding lead, or other marking substances, from end to end,
except about one quarter of an inch. For this purpose I take a slip or
ribbon of metal, of the required width and thickness, and, by bringing the
two edges nearly into contact, form a tube having a slot or opening
throughout its entire length. One end of the tube is then tapired so as to
make the aperture of the size of the marking substance employed. In
the inside of the tube I place an embolus connected with a piece of metal
on the outside by means of a thin piece of metal just capable of sliding
along the slot or opening between the two edges of the metal forming
the tube; and, as the tube is elastic, the two edges press upon the thin
piece of metal as it slides between them with a sufficient force to
prevent its sliding back in the act of using the instrument, but allowing
it to be moved backward or forward by the finger. The lead or other
marking substance being placed in the tube, the embolus is inserted
in the rear, and thus, by pushing it forward, the marking substance is
propelled through the aperture at the tapired end of the tube as it may
be required. To replenish the tube it is only necessary to slip back
the embolus to the other end, drop into the tube a fresh supply of
material, replace the embolus, and the instrument is again ready for
use.
What I claim as my Invention is the construction, arrangement, and
adaptation of a metallic tube so as to be capable of containing throughout
its entire length, except about a quarter of an inch (the space occupied

page_text: by the embolus), marking material, and suitable for the purposes of
writing and drawing.
In witness whereof, I, the said Edward Tasker, have hereunto
set my hand and seal, this Fifteenth day of September, in
of our Lord Eighteen hundred and fifty-three.
the
year
EDWARD TASKER. (L.S.)