AN IMPROVED COMPOSITION FOR PRESERVING METALLIC, WOODEN, AND OTHER SURFACES
Year: 1871

page_text: LETTERS PATENT to Samuel Sinclair Robson, of Sunderland, in the
County of Durham, Rope Manufacturer, and George Berwick,
of Sunderland, in the said County, Doctor of Medicine, for the
Invention of "AN IMPROVED COMPOSITION FOR PRESERVING METALLIC,
WOODEN, AND OTHER SURFACES."
Sealed the 16th January 1872, and dated the 20th July 1871.
PROVISIONAL SPECIFICATION left by the said Samuel Sinclair Robson
and George Berwick at the Office of the Commissioners of Patents,
with their Petition, on the 20th July 1871.
We, SAMUEL SINCLAIR ROBSON, of Sunderland, in the County of
Durham, Rope Manufacturer, and GEORGE BERWICK, of Sunderland,
in the said County, Doctor of Medicine, do hereby declare the nature
of the said Invention of "AN IMPROVED COMPOSITION FOR PRESERVING
METALLIC, WOODEN, AND OTHER SURFACES," to be as follows, that is to
say:
This Invention, which relates to a new or improved composition to be
used for preserving metallic, wooden, or other surfaces, consists of the

page_text: following approximate proportions, namely:-Crystallized or uncrystal-
lized carbolic acid, one part; coal tar, ten parts; silica in the form of sea
or river sand, from three-tenths of a part to one part; alumina in the
condition of the powder of well baked bricks or other similar articles in
clay, from three-tenths of a part to one part; calcium in the condition of
slaked or unslaked lime, from four-tenths of a part to one part; red
oxide of iron, from one-tenth of a part to half a part; white arsenic, from
one-tenth of a part to half a part; calamine, from three-tenths of a part
to half a part. The substances when compounded together form a
paint which is applied to the surfaces to be preserved by a brush or
otherwise.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Samuel Sinclair Robson and George Berwick
in the Great Seal Patent Office on the 17th January 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, SAMUEL
SINCLAIR ROBSON, of Sunderland, in the County of Durham, Rope
Manufacturer, and GEORGE BERWICK, of Sunderland, in the County of
Durham, Doctor of Medicine, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of July, in the year of
our Lord One thousand eight hundred and seventy-one, in the 36th
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto us, the said Samuel Sinclair Robson and George
Berwick, Her special license that we, the said Samuel Sinclair Robson
and George Berwick, our executors, administrators, and assigns, or such
others as we, the said Samuel Sinclair Robson and George Berwick, our
executors, administrators, or 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 "AN IMPROVED
COMPOSITION FOR PRESERVING METALLIC, WOODEN, AND OTHER SURFACES," upon
the condition (amongst others) that we, the said Samuel Sinclair
Robson and George Berwick, by an instrument in writing under our
hands and seals, should particularly describe and ascertain the nature

page_text: formed, 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 we, the said Samuel Sinclair Robson and
George Berwick, do hereby declare the nature of our said Invention,
and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement, that is to
say:
Our said Invention, which relates to a new or improved composition
to be used for preserving metallic, wooden, or other surfaces, consists of
the following approximate proportions, it is however to be understood
that the several proportions may be varied :-(1), crystallized or un-
crystallized carbolic acid, one part; (2), coal tar, either refined or
unrefined, ten parts; (3), silica in the forms of sea or river sand or flints
or other substances containing silica, from three-tenths of a part to one
part; (4), alumina in the condition of the powder of well baked bricks
or other similar articles in clay, from three-tenths of a part to one part;
(5), calcium in the condition of slaked or unslaked lime, from four-tenths
of a part to one part; (6), red oxide of iron, from one-tenth of a part
to half a part; (7), white arsenic, from one-tenth of a part to half a
part. The substances when compounded together form a paint, which
is applied to the surfaces to be preserved by a brush or otherwise.
It is further to be understood that in the phrase "coal tar refined or
unrefined" we mean coal tar having one or more of its constituents
removed or superadded, so that the proportions of the composing
substances may be thereby varied. In manufacturing the said com-
position the mineral and earthy substances above described are reduced
to fine powder and mixed together, the fluid or fluids are then added
so as to form a cement paint, which is applied to the surfaces to be
coated by means of brushes in the manner of ordinary paint.
Having now described and particularly ascertained the nature of our
said Invention, we would observe in conclusion that what we consider
to be novel and original, and therefore claim as the Invention secured to
us by the hercin-before in part recited Letters Patent is, the combination
of the before-mentioned substances in varying proportions so as to

page_text: form a composition for preserving metallic, wooden, or other surfaces,
as herein-before described.
In witness whereof, we, the said Samuel Sinclair Robson and
George Berwick, have hereunto set our hands and seals, this
Sixth day of January One thousand eight hundred and seventy-