IMPROVEMENTS IN THE MANUFACTURE OF INDIA-RUBBER AND GUTTA PERCHA COMPOUNDS
Year: 1863

page_text: LETTERS PATENT to George Tomlinson Bousfield, of Loughborough Park,
Brixton, in the County of Surrey, for the Invention of "IMPROVEMENTS IN
THE MANUFACTURE OF INDIA-RUBBER AND GUTTA PERCHA COMPOUNDS."
communication from abroad by Thomas Mayall, residing at Roxburgh,
A
Sealed the 3rd June 1864, and dated the 10th December 1863.
PROVISIONAL SPECIFICATION left by the said George Tomlinson Bous-
field at the Office of the Commissioners of Patents, with his Petition,
on the 10th December 1863.
I, GEORGE TOMLINSON BOUSFIELD, of Loughborough Park, Brixton, in the
County of Surrey, do hereby declare the nature of the Invention for "IMPROVE-
MENTS IN THE MANUFACTURE OF INDIA-RUBBER AND GUTTA PERCHA COMPOUNDS," to
be as follows:-
The ingredients of the compounds are fibres of leather, india-rubber, or
gutta percba, or these substances combined, litharge, and sulphur, the com-
pounds being subjected to artificial heat, as herein-after described. The
proportions of the said ingredients which are preferred are as follows:-About
four pounds of the fibres of leather, one pound of india-rubber or gutta percha,
Price 8d.1

page_text: separately or combined, two pounds of litharge, and two ounces of sulphur.
These are to be mixed together by a process well known to manufacturers of
india-rubber or gutta percha. After the mixture has been spread upon cloth,
or run into sheets by callendering-rolls, or any other means known to manu-
facturers of india-rubber or gutta percha,it is subjected to quick vulcanization
by heat when between metal plates. The proportions of the ingredients
specified may be varied to increase or diminish the flexibility of the article
intended to be produced; magnesia or lime, or a carbonate or sulphate of
magnesia or lime, or calcined French chalk, or other magnesian earth, or
white lead, or zinc, or oxide of metal may be used with or without litharge
in this compound, but litharge alone is preferred.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Tomlinson Bousfield in the Great Seal Patent Office
on the 9th June 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
TOMLINSON BOUSFIELD, of Loughborough Park, Brixton; in the County of
Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of December, in the year of our
Lord One thousand eight hundred and sixty-three,in the twenty-seventh year
of Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said George Tomlinson Bousfield, Her special license that I, the said
George Tomlinson Bousfield, my executors, administrators, and assigns, or
such others as J, the said George Tomlinson Bousfield, my executors, adminis-
trators, 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 INDIA-RUBBER AND
GUTTA PERCHA COMPOUNDS," a communication to me from abroad by Thomas
Mayall, a person resident at Roxburgh, in the State of Massachusetts,
United States of America, upon the condition (amongst others) that I,
the said George Tomlinson Bousfield, 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 is to be performed, and cause the same to be

page_text: 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 George Tomlinson Bousfield, 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 :-
The ingredients of compound are fibres of leather, india-rubber, and gutta
percha, separately or combined with litharge and sulphur, in the following
proportions when subjected to artificial heat, as herein-after described. The
proportions of the said ingredients are as follows:-Four pounds of the fibres
of leather, one pound of india-rubber or gutta percha, separately or combined
two pounds of litharge, and two ounces of sulphur. These are to be mixed
together by a process well known to manufacturers of india-rubber or gutta
percha. After the mixture has been spread upon cloth, or run into sheets by
callendering rolls, or any other means known to manufacturers of india-rubber
or gutta percha, it is subjected to quick vulcanization between metal plates,
also well known to manufacturers of india-rubber. The proportions of the
ingredients specified may be varied to increase or diminish the flexibility of the
article intended to be produced, magnesia or lime, or a carbonate or sulphate of
magnesia or lime, or calcined French chalk, or other magnesian earth, or
white lead, or zinc, or oxide of metal may be used with or without litharge in
this compound, but litharge alone is preferred.
What I claim as the Invention, and desire to secure by grant of Letters
Patent, is, the combination of fibres of leather with india-rubber or gutta
percha, separately or combined with litharge, with or without the use of any
of the other ingredients mentioned in the Specification, when the compound is
subjected to artificial heat to produce the product, as herein described.
In witness whereof, I, the said George Tomlinson Bousfield, have
hereunto set my hand and seal, this Seventh day of June, in the
year of our Lord One thousand eight hundred and sixty-four.
GEO. T. BOUSFIELD. (L.S).