IMPROVEMENTS IN THE MANUFACTURE OF PAINT
Year: 1868

page_text: LETTERS PATENT to John Robinson, of the Silicate and Granitic
Composition Works, Creek Road, Deptford, in the County of
Kent, for the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF
PAINT."
Sealed the 9th October 1868, and dated the 16th April 1868.
PROVISIONAL SPECIFICATION left by the said John Robinson at the
Office of the Commissioners of Patents, with his Petition, on the
16th April 1868.
I, JOHN ROBINSON, of the Silicate and Granitic Composition Works,
Creek Road, Deptford, in the County of Kent, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF
PAINT," to be as follows:-
This Invention has for its object improvements in the manufacture of
paint. For this purpose I employ as the pigment finely ground slate,
and I grind the same with linseed and other oil, boiled oil, varnish
bottoms, and litharge, or sulphate of manganese or other drier, or with
some of these materials as is usual in the manufacture of paint.
-The slate may be employed alone; and paints of different-shades-may
be obtained by selecting suitable slates; or zinc white and other

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Robinson in the Great Seal Patent Office on
the 16th October 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
ROBINSON, of the Silicate and Granitic Composition Works, Creek Road,
Deptford, in the County of Kent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of April, in the year
of our Lord One thousand eight hundred and sixty-eight, in the thirty-
first year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Robinson, Her special
licence that I, the said John Robinson, my executors, adminis-
trators, and assigns, or such others as I, the said John Robinson,
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 THE MANUFACTURE OF PAINT," upon the condition
(amongst others) that I, the said John Robinson, 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
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.
66
NOW KNOW YE, that I, the said John Robinson, 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:-
This Invention has for its object improvements in the manufacture
of paint. For this purpose I employ as the pigment finely ground
slate, and I grind the same with oil and other materials, as is usual
in the manufacture of paint.

page_text: The slate may be employed alone, and paints of different shades may
he chained by selecting suitable slates, or sine white and other
pigments may be used together with the slate, and in this way paints
of a variety of colors and shades may be produced.
Thus, for example, to make a very fine blue lead color I employ the
following ingredients:
pigments may be used together with the slate, and in this way paints
of a variety of colors and shades may be produced.
Thus, for example, to make a very fine blue lead color I employ the
following ingredients:
Best blue Bangor slate ground to a fine powder with
millstones
Ultramarine blue
"
Litharge
-
White lead
Varnish bottoms
Boiled oil
-
-
53 parts.
-
7
"
-
10
"
-
12
"
-
14
"
16
"
112
These materials are thoroughly ground together, as in making ordinary
paint.
For the white lead an equal weight of zinc white may be substituted,
and the litharge may be replaced by one-half part of sulphate of man-
ganese, and in this case the quantity of slate powder may be increased
to compensate for the difference in weights.
A. Brunswick green paint may be similarly prepared, but substituting
Brunswick green for a portion of the slate powder. 28 parts of the green
may be substituted for an equal quantity of the slate powder.
Having thus described the nature of my said Invention, and the
manner of performing the same, I would have it understood that I
do not confine myself to the exact details described; but what I claim
is, the use of powdered slate as a pigment in the manufacture of oil
paint.
In witness whereof, I, the said John Robinson, have hereunto
set my hand and seal, this Fifteenth day of October, in the
year of our Lord One thousand eight hundred and sixty-eight.