Improvements in the Manufacture of Plaster and like Tablets Applicable for Advertising and other Purposes.
Year: 1889

page_text: Date of Application, 17th Apr., 1889
· Complete Specification Left, 16th Jan., 1890-Accepted, 1st Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Plaster and like Tablets
Applicable for Advertising and other Purposes.
I, RICHARD HENRY BRUNTON of 21 Wellington Street, Strand, in the County of
Middlesex, Civil Engineer, do hereby declare the pature of this invention to be as
follows
The object of my invention is to manufacture tablets suitable for advertising or
other purposes whereby the tablets are produced in alto or bas relief, the cost of
production is very materially decreased, while the effect is much improved or
enhanced.
According to my invention I take a model of the tablet I wish to reproduce, such
model having whatever undercut or relief may be desired or required in the tablet ;
from this model I obtain a mould in gelatine: I then take fine plaster of Paris reduced
to a liquid state to which I add a small quantity of alum which tends to produce a
hardness of surface in the cast. Liquid plaster thus prepared is then inserted into the
various interstices in the mould (which is conveniently effected by a brush) and
subsequently (with the fingers) tow or other fibrous material as near the surface of
the mould as may be found practicable; layers of canvas or equivalent material, are
then placed over the whole surface and a framework of wood: Liquid plaster is now
washed over the surface and when it sets all the materials become incorporated and
the tablet is removed from the mould in one piece and then painted and decorated to
suit requirements as fancy or taste may dictate.
By the addition of alum to the plaster of Paris and the employment of tow or
other fibrous material at the surface of the castings I obtain a hard surface particularly
suitable for tablets while the gelatine moulds enable me to obtain large relief and
undercut rendering the tablets so produced according to my invention particularly
applicable to and suitable for advertising purposes.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Plaster and like Tablets
Applicable for Advertising and other Purposes.
I, RICHARD HENRY BRUNTON of 21 Wellington Street, Strand, in the County of
Middlesex, Civil Engineer, 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:-
The object of my invention is to manufacture tablets suitable for advertising or
other purposes whereby the tablets are produced in alto or bas relief.
According to my invention I take a model of the tablet I wish to re-produce, such
model having whatever undercut or relief may be desired or required in the tablet;
from this model I obtain a mould in gelatine; I then take fine plaster of Paris
reduced to a liquid state to which I add a small quantity of alum (say, about one
part of alum to twenty of plaster) which tends to produce a hardness of surface in the
cast. Liquid plaster thus prepared is then inserted into the various interstices in the
mould (which is effected by a brush) and subsequently (with the fingers) tow or
other fibrous material as near the surface of the mould as may be found practicable;
layers of canvas or equivalent material are then placed over the whole surface in
Price 6dl

page_text: conjunction with pieces of wood to stiffen and strengthen the whole mass and thus
forming a framework of wood. Liquid plaster is now washed over the surfaco and
when it sets all the materials become incorporated and the tablet is removed from the
mould in one piece and then painted and decorated to suit requirements as fancy
or taste may dictate.
By the addition of alum to the plaster of Paris and the employment of tow or other
fibrous material at the surface of the castings I obtain a hard surface particularly
suitable for tablets, while the gelatine moulds enable me to obtain large relief and
undercut rendering the tablets so produced according to my invention, particularly
applicable to, and suitable for, advertising purposes.
When tablets are required for ontside use I steep them in a bath of boiled linseed
oil this fills all the pores in the plaster work and renders it impervious to moisture
and so capable of resisting all atmospheric changes.
Tablets constructed in the manner before described are or may be surrounded by a
frame the latter being protected by a fillet of wood sufficiently high to protect the
relief surface of the tablets and also to allow of packing one on another for transport.
Such frames and fillets enclosing tablets constructed according to my invention as
herein before described are shewn in section in the accompanying drawing. The
said drawing shews on the left side of same marked A two half sections of tablets
in bas-relief and the tablets are shewn placed on one another as for packing and
distanced by the frames D. The right hand side marked B also shews two half
tablets in alto relief. C is the plaster, and D the frame with the wood fillet as
before described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
:-
1. The combination of Plaster of Paris, alum, tow, canvas, and wood to the manu-
facture of relief tablets of any depth or undercut by means of a gelatine mould
substantially as and for the purposes set forth.
2. The relief tablets constructed substantially as set forth.
3. The frame constructed and arranged as described and shewn in combination with
relief tablets constructed substantially as and for the purposes set forth.
Dated this 16th day of January 1890
Dated this 16th day of January 1890.
R. H. BRUNTON.
By Brewer & Son,
33, Chancery Lane, London, Patent Agents.