IMPROVEMENTS IN THE MANUFACTURE OF CARDS, TABLETS, AND OTHER ARTICLES, FROM WHICH MARKS MADE WITH WATER COLORS, INK, OR PENCIL MAY BE REPEATEDLY ERASED BY MOISTURE WITHOUT INJURY TO THE SURFACE
Year: 1867

page_text: LETTERS PATENT to Thomas Nelson, of Hope Park, Edinburgh, and
29, Paternoster Row, in the City of London, for the Invention of
"IMPROVEMENTS IN THE MANUFACTURE OF CARDS, TABLETS, AND OTHER
ARTICLES, FROM WHICH MARKS MADE WITH WATER COLORS, INK, OR PENCIL
MAY BE REPEATEDLY ERASED BY MOISTURE WITHOUT INJURY TO THE
SURFACE."
Sealed the 5th November 1867, and dated the 11th May 1867.
PROVISIONAL SPECIFICATION left by the said Thomas Nelson at the
Office of the Commissioners of Patents, with his Petition, on the
11th May 1867.
I, THOMAS NELSON, of Hope Park, Edinburgh, and 29, Paternoster Row,
in the City of London, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE MANUFACTURE OF CARDS, TABLETS, AND OTHER
ARTICLES, FROM WHICH MARKS MADE WITH WATER COLORS, INK, OR PENCIL MAY BE
REPEATEDLY ERASED BY MOISTURE WITHOUT INJURY TO THE SURFACE," to be as
follows:-
According to this Invention, printed, colored, or ruled cards, tablets, or
sheets of paper, or other material, are coated with a film of transparent
substance which protects without concealing any colored or printed matter, or

page_text: ruled lines which may be upon such card, tablet, or sheet of paper, or other
material, and which forms a surface for temporary writing or marking, either.
with water colors, ink, or pencil. Writing or marks in water colors, ink, or
pencil may be repeatedly produced upon and erased from the surface of the
said sheet of paper or other material without injury to the transparent covering
or to printed matter underneath. The said water colors, ink, or pencil marks
are erased by slightly moistening and rubbing the prepared surface.
The composition I employ according to my Invention for producing the
transparent waterproof coating is a soluble-silicate, such-as-silicate-of-potash-
or silicate of soda, either or both of which are known as soluble glass. I take
the silicate of potash or silicate of soda, otherwise known as soluble glass, and
dissolve it in water by boiling or otherwise. I then coat the sheet of paper or
It is
other material with it, and dry it by exposing it to a considerable heat.
then ready for use.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Nelson in the Great Seal Patent Office on the
9th November 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
NELSON, of Hope Park, Edinburgh, and 29, Paternoster Row, in the City of
London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of May, in the year of our Lord
One thousand eight hundred and sixty-seven, in. the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Thomas Nelson, Her special licence that I, the said Thomas Nelson,
my executors, administrators, and assigns, or such others as I, the said
Thomas Nelson, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 "IM-
PROVEMENTS IN THE MANUFACTURE OF CARDS, TABLETS, AND OTHER ARTICLES; PROM
WHICH MARKS MADE WITH WATER COLORS, INK, OR PENCIL MAY BE REPEATEDLY
ERASED BY MOISTURE WITHOUT INJURY TO THE SURFACE," upon the condition
(amongst others) that I, the said Thomas Nelson, my executors: or.

page_text: 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.
NOW KNOW YE, that I, the said Thomas Nelson, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
According to this Invention, printed, colored, or ruled cards, tablets, or
sheets of paper or other material are coated with a film of transparent sub-
stance which protects without concealing any colored or printed matter or
ruled lines which may be upon such card, tablet, or sheet of paper, or other
material, and which forms a surface for temporary writing or marking, either
with water colors, ink, or pencil. Writing or marks in water colors, ink, or
pencil may be repeatedly produced upon and erased from the surface of the
said sheet of paper or other material without injury to the transparent
covering, or to printed matter underneath. The said water colors, ink, or
pencil marks are erased by slightly moistening and rubbing the prepared
surface.
:
The composition I employ according to my Invention for producing the
transparent waterproof coating is a soluble silicate, such as silicate of potash
or silicate of soda, either or both of which are known as soluble glass. I
take the silicate of potash or silicate of soda, otherwise known as soluble
glass, and dissolve it in water by boiling or otherwise. I then coat the sheet
of paper or other material with it, and dry it by exposing it to a considerable
heat. It is then ready for use.
I employ by preference a solution of silicate of potash of a sp. gr. of 1.1465
or thereabouts, and by means of a brush I well and thoroughly coat surfaces
of paper or of card therewith, afterwards I dry the paper or card, and expose
it in an oven or in other convenient manner to as high a heat as can safely
be used, avoiding the scorching of the paper or card.
In place of paper or card woven fabric of which the surface is prepared for
writing and drawing may be employed, but not so advantageously.
What I claim is the manufacture of cards, tablets, and other articles from
which marks made with water colors, ink, or pencil may be repeatedly erased
by moisture without injury to the surface, by coating cards, tablets, and other

page_text: described.
In witness whereof, I, the said Thomas Nelson, have hereunto set my
hand and seal, this Eighth day of November, in the year of our Lord
One thousand eight hundred and sixty-seven.
THOMAS NELSON. (L.S.)