A NEW AND USEFUL IMPROVEMENT IN ELASTIC MOULDS
Year: 1868

page_text: LETTERS PATENT to Henri Adrien Bonneville, of the British and
Foreign Patent Offices, 10, Sackville Street, Piccadilly, in the
County of Middlesex, and 18, Chaussée d'Antin, Paris, in the Empire
of France, Patent Agent, for the Invention of "A NEW AND USEFUL
IMPROVEMENT IN ELASTIC MOULDS."-A communication from Thomas
Taylor, Edmund Pendleton Rogers, and Miers Coryell, residing at
New York City, in the State of New York, United States of
America.
Sealed the 9th April 1869, and dated the 15th October 1868.
COMPLETE SPECIFICATION filed by the said Henri Adrien Bonneville
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 15th October 1868, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRI
ADRIEN BONNEVILLE, of the British and Foreign Patent Offices, 10,
Sackville Street, Piccadilly, in the County of Middlesex, and 18, Chaussée
d'Antin, Paris, in the Empire of France, Patent Agent, send greeting.
וג.In

page_text: WHEREAS I am in possession of an Invention for "A NEW AND USEFUL
IMPROVEMENT IN ELASTIC MOULDS," a communication from Thomas Taylor,
Edmund Pendleton Rogers, and Miers Coryell, three persons resident
at New York City, in the State of New York, United States of America,
and have petitioned Her Majesty to grant unto me, my executors,
administrators, and assigns, Her Royal Letters Patent for the same,
and made solemn Declaration that it is a communication.
NOW KNOW YE, that I, the said Henri Adrien Bonneville, do
hereby declare that the following Complete Specification, under my
hand and seal, fully describes and ascertains the nature of the In-
vention, and the manner in which the same is to be performed, that
is to say:-
The nature of the Invention communicated to me consists in making
a mould of such material or composition as to suit it especially to
undercut work, thus saving time, expense, number of pieces, and so
forth.
When casting plastic substances, such as plaster of Paris, wax, clay,
or such-like materials it is sometimes desirable to use elastic moulds,
especially when undercut work has to be multiplied. A composition of
glue and wax, glue and sugar, and other compounds has been employed,
and frequently gelatines in a pure condition, but it has been found in
practice that such moulds are easily destroyed by water and low degrees
of heat. To avoid this general objection rubber is taken which has
been properly prepared for vulcanization and placed over a metallic
pattern, and by means of back and front metal moulds, plates, or
fixtures, the pattern and rubber compound is securely enclosed, pressure
being applied to the external surfaces to force the composition into the
under cutting, in this way taking a perfect impression of the pattern.
In this condition it is subjected to sufficient degree of heat in the usual
well-known manner. When the rubber is removed it is fit for use and
may be employed for casting plastic objects, cements, soap, wax, as well
as for electro-typing purposes, and even fusible metals which melt at a
low temperature. It is also proposed to use the elastic moulds for con-
fectionery purposes, as the heat of liquid sugar will not destroy the
moulds; and also for the use of potters, as clay may be cast into the
moulds and removed with great ease in the moist state, after which the
clay should be baked in the usual manner.

page_text: For works of art much under cut, incisions should generally be made
in the rubber compound or mould at the under cut points, so that a
cast of plaster or wax may be easily removed from the mould without
breaking it. What is termed a back mould of plaster or other suitable
material is generally used to hold the rubber mould in position and
keep the parts together whilst any plastic substance is poured into the
mould. In making casts from rubber moulds care must be taken not
to use any form of oil, as it will soften the rubber and render it useless;
instead thereof a little moisture or alcohol is used previous to pouring
the plastic material into the moulds in order to prevent it from adhering
to the mould.
Having thus fully described and ascertained the nature of the said
Invention, and the manner in which the same is to be performed, I
would have it to be clearly understood that I do not intend to confine
myself to the exact details herein contained, as the same may be
obviously modified without departing from the principle of the Inven-
tion; but what I claim is, the use and application of vulcanized
rubber for the purpose herein set forth..
In witness whereof, I, the said Henri Adrien Bonneville, have
hereunto set my hand and scal, this Thirteenth day of October,
in the year of our Lord One thousand eight hundred and sixty-
eight.
H. BONNEVILLE. (L.S.)