Improvements in Cloisonne Mirrors.
Year: 1899

page_text: Date of Application, 14th Feb., 1899-Accepted, 29th Apr., 1899
COMPLETE
SPECIFICATION.
Improvements in Cloisonne Mirrors.
We, THEOPHIL PFISTER and EMIL BARTHELS, both of 5, 6 and 7, Leusden
Place, Golden Lane, London, in the County of Middlesex, Manufacturers, do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
-
This invention relates to improvements in cloisonné work of the kind described
in the Specification of our prior Letters Patent No. 1995 of 1897, and has for
its chief object more particularly to facilitate the manufacture of cloisonné panels
and the like in which a portion of each panel, for example the background,
serves as a mirror or reflector. The chief feature of our invention has reference
to the protection of the metal contour of the design while the plate is being
silvered.
In carrying out our invention, we form the contour or outline of the design
by means of strips of metal fastened on the back of the glass pane which ulti-
mately forms the front of the panel, and we then apply around this contour a
protective substance which prevents the accidental displacement or derangement
of the contour strips during the operation of silvering that portion of the plate
not occupied by the design. We do not confine ourselves to the use of any
particular substance for this purpose, but we prefer to use oil paint which can
be easily and conveniently applied by means of a knife or spatula or the like,
and which when set forms a very effective protection to the contour strips. The
background of the plate or that portion not occupied by the design can then
without risk of disturbing the contour strips be silvered, in any ordinary or
suitable manner, to convert the same into a mirror, and the silvering may be
protected by a coating such as is usually applied to the backs of mirrors.
The panel is then completed in the manner described in the specification above
referred to, that is to say, the cloisons or metal strips forming the markings or
divisions of the design, if any such are required, are fastened to the plate within
the outline already fixed in place, and the design is then filled in with broken
glass of the proper colours if a transparency is required, or with powdered
materials if opaque work is to be produced, after which the glue or equivalent
substance is added to cement the loose particles together. The background,
being silvered, need not be filled in, but may be left empty if desired.
When
the cementing substance has set, the backing plate is applied and secured around
the edges. In the case of opaque work the back may be formed by a layer of
cement as described in the above mentioned specification or by any other suitable
material.
In the accompanying drawings, Fig. 1 is a plan of a small unfinished piece of
work illustrating my invention, and Fig. 2 is a section of the same on the line x, y.
A, is the glass pane forming the front of the complete panel, B is the metal
outline of the design fastened on the back of the plate A, in this case a double
outline being shown, and C is the protective coating of oil paint or other sub-

page_text: stance applied to the metal outline. The part of the plate A not occupied by
the design is silvered and then the panel is completed in the manner above
described.
We may if required make panels or the like by this method with two or more
separate and distinct designs at different parts of them, the intermediate spaces
or background being silvered.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is:
1
1. In the manufacture of cloisonné mirrors, protecting the metal outline or
contour of the design by a substance applied around it prior to the silvering
operation, substantially as, and for the purpose, specified.
2. A cloisonné mirror produced as herein described.
GEORGE HARRISON,
35, Therapia Road, Honor Oak, London, Agent for the Applicants.