IMPROVE- MENTS IN COMPOUNDS FOR WATERPROOFING TEXTILE FABRICS AND OTHER SURFACES
Year: 1870

page_text: LETTERS PATENT to John Macintosh, of North Bank, Regent's
Park, in the County of Middlesex, for the Invention of "IMPROVE-
MENTS IN COMPOUNDS FOR WATERPROOFING TEXTILE FABRICS AND OTHER
SURFACES."
Sealed the 2nd June 1871, and dated the 6th December 1870.
PROVISIONAL SPECIFICATION left by the said John Macintosh at
the Office of the Commissioners of Patents, with his Petition, on
the 6th December 1870.
I, JOHN MACINTOSH, of North Bank, Regent's Park, in the County
of Middlesex, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN COMPOUNDS FOR WATERPROOFING TEXTILE FABRICS AND OTHER
SUBFACES," to be as follows:-
In making waterproof compounds I take five parts of mithylated
alcohol and one quarter part of castor oil, in which is dissolved two parts
of pulverised resin, kauri, or cowdee. I then add four parts of lamp-
black, and mix the whole thoroughly together until it becomes a thick

page_text: plastic homogeneous mass, in which state it may be rolled or spread on
cloth.
The above proportions may be varied according to the purpose for
which the compound is required.
Another Mode of Making Waterproof Compounds.-I take one part 5
by measure of india-rubber paste and six parts of lampblack; when the
whole is mixed, as is well understood, it is ready for use.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Macintosh in the Great Seal Patent Office
on the 6th June 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
MACINTOSH, of North Bank, Regent's Park, in the County of Mid-
dlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of December, in the year of
our Lord One thousand eight hundred and seventy, in the thirty-
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said John Macintosh, Her special licence that I, the
said John Macintosh, my executors, administrators, and assigns, or such
others as I, the said John Macintosh, 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 COMPOUNDS FOR WATER-
PROOFING TEXTILE FABRICS AND OTHER SURFACES," upon the condition (amongst
others) that I, the said John Macintosh, my executors or adminis-
trators, 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.

page_text: NOW KNOW YE, that I, the said John Macintosh, 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 :-
In making waterproof compounds I take five parts of methylated
alcohol and one quarter part of castor oil, in which is dissolved two
parts of pulverised resin, kauri, or cowdee. I then add four parts of
lampblack, and mix the whole thoroughly together until it becomes
a thick plastic homogeneous mass, in which state it may be rolled or
spread on cloth.
The above proportions may be varied according to the purpose for
which the compound is employed.
Another Mode of Making Waterproof Compounds.-I take one part
by measure of india-rubber paste and six parts of lampblack; when the
whole is mixed, as is well understood, it is ready for use.
Now it is well known that fabrics coated with india-rubber will
become rigid when exposed to cold temperatures, and the same will
become sticky and decompose through heat and constant exposure to
atmosphere. These defects have hitherto been partly remedied by heat
and the use of sulphur in a process known by the term vulcanizing, and
the ordinary method employed in waterproofing woollen fabrics has
been first to cover the fabric with a solution of india-rubber and after-
wards to lay on to it and to cause it to adhere to a cotton fabric, also
coated with india-rubber, but having on its other surface another coating
of india-rubber which has undergone the process of vulcanizing.
Now my Invention has for one of its objects the advantages of
obviating the said expensive processes, and especially that of vulcanizing,
and I effect it by the use of large quantities of lampblack because it is a
pure carbon in its uncrystallized state, and is a preservative of india-rubber
when a large proportion of the said carbon is combined therewith. The
carbon being inorganic and in large quantity as aforesaid it neutralizes
the tendency of a small quantity of india-rubber (known to be organic)
to decompose, and thus a new and inexpensive compound is produced by
which fragile woollen and other fabrics, substances, or surfaces may be
waterproofed without being affected or injured by extreme heat or cold
or exposure to the atmosphere.

page_text: Having now described the nature of my Invention, I would have it
understood that I do not confine myself to the precise proportions herein.
before mentioned, as they may be modified without departing from the
nature of my Invention; but what I claim is, -
Firstly. The waterproof compound described in the first part hereof.
I am well aware that lampblack or carbon has been combined with
india-rubber, but only in small quantities and merely as a coloring
matter; but what I claim, secondly, is, the combination of lamplack
or carbon with india-rubber in large proportions so as to act as a pre-
servative of the small proportion of india-rubber employed.
In witness whereof, I, the said John Macintosh, have hereunto
set my hand and seal, this Sixth day of June, in the year of our
Lord One thousand eight hundred and seventy-one.
Witness,
JNO. M. MACINTOSH.
JOHN MACINTOSH. (L.s.)