Improvements in and relating to the Production of Slated Surfaces.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to the Production of Slated Surfaces.
I, WILLIAM HENRY BRAWLEY, of 6 Portpool Lane Gray's Inn Road, in the
County of London, Writing Slate Manufacturer do hereby declare the nature of
this invention to be as follows:-
This invention relates to the production of a slated surface adapted to be applied
to a base or backing of wood, cardboard, cloth or other suitable materials forming
an exceedingly smooth finished surface, which can be readily written upon or
marked by a lead pencil or like instrument, and which is of such a nature that
the marks made by writing or drawing thereon may be conveniently and
expeditiously expunged therefrom by the use of water and a cloth or sponge or by
equivalent means.
To produce my slated surface I proceed as follows;-If the base or backing is
of wood or other porous material, I coat it with a first coat of a compound
consisting of glue, water and boiled linseed oil. But if the base or backing is of
cardboard or like material of a practically, non-porous character, I employ as first
coat a compound consisting of magnesium carbonate, bolted whiting, and Iceland
cryolite, added to a solution of gelatine or glue, or other gelatinous or glutinous
substance dissolved in water.
The first cont is applied to the wood, cardboard or other material in
any suitable
manner and is allowed to dry, after which the material is given two coats of a
compound consisting of magnesium carbonate, bolted whiting, and Iceland cryolite,
added to a solution of shellac dissolved in methylated spirits or other suitable
solvent.
The surface is then either calendered or sand papered with fine emery paper or
the like, according to the material on to which the slating surface has been applied.
After this the surface is coated with a top surface or finishing of sodium silicate
dissolved in water applied as a thin coating or wasli by means of a sponge or
chamois leather.
Improvements in and relating to the production of. Slated surfaces.
I, WILLIAM HENRY BRAWLEY, of 6 Portpool Lane, Gray's Inn Road, in the
County of London, Writing Slate Manufacturer, do hereby declare the nature of
this invention and in what manner the, same is to be performed to be particularly
described and ascertained in and by the following statement :-
This invention relates to the production of a slated surface adapted to be applied
to a base or backing of wood, cardboard, cloth or other suitable material forming

page_text: an exceedingly smooth finished surface, which can be readily written upon or
marked by a lead pencil or like instrument, and which is of such a nature that
the marks made by writing or drawing thereon may be conveniently and
expeditiously expunged therefrom by the use of water and a cloth or sponge or by
equivalent means.
To produce my slated surface I proceed as follows; If the base or backing is
of wood or other porous material, I coat it with a first coat of a compound
consisting of glue, water and boiled linseed oil in about the following
proportions;
expeditiously expunged therefrom by the use of water and a cloth or sponge or by
equivalent means.
To produce my slated surface I proceed as follows; If the base or backing is
of wood or other porous material, I coat it with a first coat of a compound
consisting of glue, water and boiled linseed oil in about the following
proportions ;-
(1) Common glue
Water
-
Boiled linseed oil
-
-
lb.
gallon,
2 fluid ounces..
But if the base or backing is of cardboard, or like material of a practically
non-porous character, I employ as first coat a compound consisting of magucsium
carbonate, bolted whiting and Iceland cryolite added to a solution of gelatine or
glue, or other gelatinous or glutinous substance dissolved in water, the ingredients
being used in about the following proportions ;-
(1)
Magnesium carbonate
Bolted whiting
-
4 ounces,
-
4 ounces,
⚫Iceland cryolite
-
4 ounces,
Gelatine or glue or other gelatinous
or glutinous substance
-
4 ounces,
Water
gallon.
The first coat of the compound (1) or (1) according to the nature of the base
or backing used, is applied to the wood, cardboard or other material by a brush or
in any other suitable manner in a cold and natural state and is allowed to dry under
ordinary atmospheric conditions, after which the material is given two coats of a
compound consisting of magnesium carbonate, bolted whiting and Iceland cryolite
added to a solution of shellac dissolved in methylated spirits or other suitable
solvent, the ingredients being used in about the following proportions ;—
Magnesium carbonate
(2) and (3)
Bolted whiting
Iceland cryolite
-
4 ounces,
-
4 ounces,
-
4 ounces,
-
2 lbs.,
-
gallon
Or other suitable solvent as required.
Shellac
Methylated spirits
-

page_text: Every base or backing is thus subjected to four successive coatings either
1, 2, 3 and 4, or 1, 2, 3 and 4, according to the nature of the material of said
base or backing. Also if a coloured or tinted surface is desired any suitable
colouring material may be added to any one or more of the various coatings.
The proportions above given may be varied considerably, proportions have
merely been stated which have been found efficient.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. The production of a slated surface on wood or other porous material, by
the application thereto in the manner substantially as hereinbefore described of
four coatings as follows;-One coat of a compound consisting of glue, water and
boiled linseed oil, two coats of a compound consisting of magnesium carbonate,
bolted whiting, and Iceland cryolite added to shellac dissolved in a suitable
solvent, and a final coat or top finishing of sodium silicate dissolved in water.
2. The production of a slated surface on cardboard or other practically
non-porous material by the application thereto in the manner substantially as
hereinbefore described of four coatings as follows;-One coat of a compound
consisting of magnesium carbonate, bolted whiting, and Iceland cryolite added to
a gelatinous or glutinous substance dissolved in water, two coats of a compound
consisting of magnesium carbonate, bolted whiting, and Iceland cryolite added to
shellac dissolved in a suitable solvent, and a final coat or top finishing of sodium
silicate dissolved in water.
3. For the production of a slated surface the several compounds hereinbefore
described prepared from the ingredients respectively given and used in substantially
the proportions stated.
4. A slated surface produced in the manner and with the compounds prepared
substantially as described.
Dated this 4th day of May 1907
F. W. GOLBY,
36 Chancery Lane, London, W.C., Patent Agent for the Applicant.