IMPROVEMENTS IN THE MANUFACTURE OF GAS TUBING AND OTHER ARTICLES OF INDIA-RUBBER
Year: 1868

page_text: LETTERS PATENT to Thomas Jefferson Mayall, of Roxbury, Massa
chusetts, United States of America, now of No. 8, Southampton
Buildings, Chancery Lane, in the County of Middlesex, for the
Invention of "IMPROVEMENTS IN THE MANUFACTURE OF GAS TUBING
AND OTHER ARTICLES OF INDIA-RUBBER."
Sealed the 5th January 1869, and dated the 8th July 1868.
PROVISIONAL SPECIFICATION left by the said Thomas Jefferson
Mayall at the Office of the Commissioners of Patents, with his
Petition, on the 8th July 1868.
I, THOMAS JEFFERSON MAYALL, of Roxbury, Massachusetts, United
States of America, now of No. 8, Southampton Buildings, Chancery
Lane, in the County of Middlesex, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF GAS TUBING
AND OTHER ARTICLES OF INDIA-RUBBER," to be as follows:-
My Invention relates to covering or coating the surface of india-rubber
tubing and other articles employed for conducting or holding gas or
other fluids with an elastic varnish or composition to protect the tubing

page_text: or other article from the injurious effects of certain substances contained
in such gas or fluid, and also to means for protecting the exterior of such
tubing and other articles, and improving the appearance of the same.
The said Invention consists chiefly in the novel combination of
ingredients forming the varnish or coating, and also to a novel compound
or combination of substances for forming such tubes and other articles.
The coating or lining for the interior surface of the tubes or other
articles is composed of linseed oil, fine litharge, or white lead, in the
proportion of one quart of oil to one pound of litharge. These sub-
stances are well boiled together until brought to the proper thickness
or body, and while hot the composition is applied by running it through
the tube to be coated or lined. To form the varnish for the outside of
the tubes or other articles I mix one quart of linseed oil with one half
pound of litharge, and add to the same about a gill of gold size. These
ingredients are well boiled together, and while hot are applied to the tube
with a sponge or brush. When the tube is properly varnished it should
be hung up to dry in a room or chamber suitably heated for the purpose.
My improved varnish may be applied to any kind of india-rubber
tubing, but I prefer to make such tubing of a compound consisting of
india-rubber, zinc, pipeclay, gum, shellac, white resin, and sulphur. I
mix the ingredients in the proportion of four pounds of rubber, two
pounds of zinc, three pounds of pipeclay, one pound of shellac, one
quarter of a pound of resin, and one half pound of sulphur. This
compound should be subjected for about two hours to a temperature of
two hundred and sixty degrees Fahrenheit, more or less. The pro-
portions of the ingredients in this compound may be varied, if desired,
within certain limits. Any desired coloring matter may be mixed with
the varnish for coating the exterior of the tubes or other articles, which
may thus have imparted to them a highly ornamental or finished
appearance.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Jefferson Mayall in the Great Seal Patent
Office on the 8th January 1869.

page_text: America, now of No. 8, Southampton Buildings, Chancery Lane, in
the County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eighth day of July, in the year of
our Lord One thousand eight hundred and sixty-eight, in the thirty-
second year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Thomas Jefferson Mayall, Her
special licence that I, the said Thomas Jefferson Mayall, my executors,
administrators, and assigns, or such others as I, the said Thomas
Jefferson Mayall, 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 GAS TUBING AND
OTHER ARTICLES OF INDIA-RUBBER," upon the condition (amongst others)
that I, the said Thomas Jefferson Mayall, 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.
NOW KNOW YE, that I, the said Thomas Jefferson Mayall, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
My Invention relates to covering or coating the surface of india-rubber
tubing and other articles employed for conducting or holding gas or
other fluids with an elastic varnish or composition to protect the tubing
or other article from the injurious effects of certain substances contained
in the gas or fluid, and also to means for protecting the exterior of such
tubing and other articles, and improving the appearance of the same.
The said Invention consists chiefly in the novel combination of
ingredients forming the varnish or coating, and also in a novel compound
or combination of substances for. formning such tubes and other articles.

page_text: The coating or lining for the interior surface of the tubes or other
articles is composed of linseed oil, and fine litharge, or white lead, in the
proportion of one quart of oil to one pound of litharge. These sub-
stances are well boiled together until brought to the proper thickness
or body, and while hot the composition is applied by running it through
the tube to be coated or lined. To form the varnish for the outside of
the tubes or other articles, I mix one quart of linseed oil with one half-
pound of lithage, and add to the same about a gill of gold size. These
ingredients are well boiled together and while hot are applied to the tube
with a sponge or brush. When the tube is properly varnished it should
be hung up to dry in a room or chamber suitably heated for the purpose.
My improved varnish may be applied to any kind of india-rubber
tubing, but I prefer to make such tubing of a compound consisting of
india-rubber, zinc, pipeclay, gum shellac, white resin, and sulphur. I
mix the ingredients in the proportion of four pounds of rubber to two
pounds of zinc, three pounds of pipeclay, one pound of shellac, one-
quarter of a pound of resin, and one-half pound of sulphur. This
compound should be subjected for about two hours to a temperature of
two hundred and sixty degrees Fahrenheit, more or less.
The pro-
portions of the ingredients in this compound and in the other compounds
herein described may be varied, if desired, within certain limits. Any
desired colouring matter may be mixed with the varnish for coating the
exterior of the tubes or other articles, which may thus have imparted to
them a highly ornamental or finished appearance.
Having thus fully described my said Invention, and shown how the
same may be conveniently and advantageously carried into practice,
I claim,-
First. The elastic varnish or composition consisting of the herein
specified ingredients combined, substantially in the proportions and in
the manner set forth, for coating or lining the interior of india-rubber
tubes and other articles.
Second. The elastic varnish or composition consisting of the herein
specified ingredients combined, substantially in the proportions and in

page_text: Third. The compound consisting of the herein specified ingredients
combined, substantially in the proportions and in the manner set forth,
for forming the tubing.
In witness whereof, I, the said Thomas Jefferson Mayall, have
hereunto set my hand and seal, this Fourth day of January, in
the year of our Lord One thousand eight hundred and sixty-nine.
THO. J. MAYALL. (L.S.)