A New or Improved Method for the Ornamentation of Glass.
Year: 1888

page_text: Date of Application, 16th Oct.; 1888
Complete Specification Left, 16th July, 1889-Accepted, 17th Aug., 1889
PROVISIONAL. SPECIFICATION.
A New or Improved Method for the Ornamentation of Glass.
I, WILLIAM MARSTON DERRICK, of 18 Alexandra Park, Redland, in the City and
County of Bristol, Artist do hereby declare the nature of this invention to be as
follows:-
1st. Two sheets of glass the surfaces of which are found to be capable of lying
closely together throughout their extent are cleaned and cut to one size.
2nd. Finely ground transparent oil colours such as are used for the painting of
Magic Lantern slides are then spread over (either singly or in different tints) one
surface of each piece of glass (hereafter called the glasses)!
3rd. These surfaces are then placed together & the two glasses subjected to as much
pressure as is necessary to make them hold tightly together and squeeze out superflous
paint.
4th. The glasses are now gently separated from each other by means of the blade
of a knife, great care being taken that the glasses do not slide upon each other and
thus destroy the peculiar forms taken by the paint during this process of separation.
5th. After separation the glasses are laid horizontally and allowed to dry
undisturbed.
6th. When the paint has become sufficiently dry as to withstand pressure without
altering its forms, a solution of glue or gum is passed over its surface and on this
solution there is at once carefully placed a layer of a bright metal in very thin sheet
form such as the gold and silver "leaf" (and its imitations) in use by gilders or
these same prepared upon paper and known as gold and silver papers or the imitations
thereof. Whichever of these materials now mentioned are used it requires to be
firmly attached to the paint underneath by being pressed down between all the ridges
of paint (which the operation numbered 4th will have caused) by the use of a dabber
made of soft cloth or such like material.
7th. When the bright or light reflecting material is dry a coat of paint is given to
its back to preserve it, and when this again is dry the cleaning of the fronts or
unpainted surfaces of the sheets of glass (or glasses) completes the whole of my new
or improved method for the ornamentation of glass.
Dated this Thirteenth day of October 1888:
WILLIAM MARSTON DERRICK.
COMPLETE SPECIFICATION.
A New or Improved Method for the Ornamentation of Glass.
I, WILLIAM MARSTON DERRICK of 18 Alexandra Park, Redland in the City "and
County of Bristol, Artist, 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 :—
Two sheets of glass the surfaces of which are found to be capable of lying closely
together throughout their extent are cleaned and cut to one size. Finely ground,
transparent oil colours or paints such as are used for the painting of magic Lantern
slides or those employed by artists in painting parts of their pictures are then taken
and freed from the excess of oil (or other slowly drying medium they generally
contain) by their being spread for a short time on a sheet or piece of unglazed paper
or other moderately absorbent material.
As soon as this excess of an oily nature has been corrected a little copal varnish
mixed with the paints prepares them for being spread (either singly or in different

page_text: colours or tints) upon one surface of both pieces of glass hereinafter called the glasses.
The spreading of the paint is best performed with a brush and it should be evenly
distributed over the surfaces to be ornamented. This done, the painted surfaces are
brought into contact and the glasses squeezed together with as much pressure as will
make the paint between them adhere tightly to one and the other at the same time
over the whole extent of surface to be ornamented and to force out (should there be
any) the superfluous paint.
-
The pressing of the hands against the outer surfaces will generally be found to give
sufficient pressure (for the above purpose) for glasses not containing more than two
thirds of a superficial foot. But pièces or sheets of glass each containing greater
superficial measurement than this now given require (to be ornamented by my method)
the pressure only to be obtained from the use of a screw lever or other press.
In this latter case the glasses are made to rest on some kind of level cushion and
the necessary pressure is given through the medium of an India-rubber block (or one
made of similar elastic material) which said block acts as a softener or buffer between
the applied force and the glasses operated upon but note that no necessity exists that
this said block should be as large as the glasses (neither need it be as large as the
cushion aforementioned) as the said glasses can be moved to receive the necessary
pressure where and in what part they should require it for the purpose of being
thoroughly attached to each other by means of the paint or paints chosen. Firm
attachment of the glasses to each other being obtained a knife or thin wedge must be
gently inserted between their edges on one side and as much space obtained as will
permit of the introduction of the operator's fingers to complete the entire separation
of one glass from its fellow.
The paint will now be found to have been drawn into peculiarly shaped. branch-like
ridges on both glasses and nothing further can well be done to them until the paint is
dry unless, an open or unornamented space is desired upon the glasses in which case
the paint (if found upon the space desired to be clear) can be easily wiped away with
a rag upon which has been spread a little turpentine. To help the drying of the paint
the glasses are placed in a warm room or chamber. When the paint has become
sufficiently dry as to withstand pressure without altering its form the glasses are laid
with their unpainted surfaces downwards whilst the paint has a solution of gum or
glue passed over its surface and on this solution there is at once placed a layer of a
bright metal in very thin sheet form such as the gold and silver leaf" (and its or
their imitations) in use by gilders and others or these same prepared upon paper and
known as gold and silver papers (or the imitations thereof). Whichever of these
materials now mentioned are used it requires to be firmly attached to the paint hy, its
being pressed down (by the use of a cloth or other dabber) between the ridges. of
paint which the process of separating the glasses will have caused. When the bright
or light reflecting material is dry a coat of paint is given to its back to preserve
and when this again is dry the cleaning of the fronts or unpainted surfaces of the
glasses completes the whole of my new or improved method for the ornamentation of
glass.
it
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
The method of producing on two sheets or pieces of glass and with transparent, oil
colours a natural ornamentation substantially as herein before described.
D
1000
WILLIAM MARSTON DERRICK.