Improvements in Plaster Boards or Slabs for the Construction of Ceilings, Walls, and Partitions.
Year: 1893

page_text: Date of Application, 14th Mar., 1893
Complete Specification Left, 12th Dec., 1893-Accepted, 13th Jan.,
189,4
PROVISIONAL SPECIFICATION.
Improvements in Plaster Boards or Slabs for the Construction of
Ceilings, Walls, and Partitions.
I, FRIEDRICH SCHWEITZER, Manufacturer, of 8 Bandelstrasse, Düsseldorf, in
the German Empire, do hereby declare the nature of this invention to be as
follows:-
:-
In order to increase the durability of plaster boards intended for building
purposes, I add to the gypsum, spent dye wood or tanner's bark (after the
colouring matter or tannin has been extracted therefrom in the usual way) and in
some cases, a small quantity of glue, preferably in the proportions of 100 parts
(by weight) of gypsum to 25 parts of dyewood or tanner's bark (in a finely divided
condition) and 1 part of glue.
The method of forming the raw material into plates, boards or slabs may be as
usual, that is to say, the raw material is converted into a thick paste by the addition
of water, and subsequently moulded into the desired shape.
If the plaster boards are intended for the construction of ceilings, and to be
fixed to the ceiling joints, they are preferably made thin and provided with a
core or skeleton consisting of one or more sheets of canvas or other suitable
fabric.
Some bars of iron or steel may also be placed in the interior of the board or
slab, in order to increase its strength.
Dated this 13th day of March 1893.
FAIRFAX & WETTER,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Plaster Boards or Slabs for the Construction of
Ceilings, Walls, and Partitions.
I, FRIEDRICH SCHWEITZER, Manufacturer, of 8 Bandelstrasse, Düsseldorf, in
the German Empire, 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 :-
In order to increase the durability of plaster boards intended for building
purposes, I add to the gypsum, spent dye-wood or tanner's bark (after the
colouring matter or tannin has been extracted therefrom in the usual way) and in
some cases, a small quantity of glue, preferably in the proportions of 100 parts
(by weight) of gypsum to 25 parts of dyewood or tanner's bark (in a finely divided
condition) and 1 part of glue.
The method of forming the raw material into plates, boards or slabs may be as
usual, that is to say, the raw material is converted into a thick paste by the
addition of water, and subsequently moulded into the desired shape.
If the plaster boards are intended for the construction of ceilings, and to be
fixed to the ceiling joints, they are preferably made thin and provided with a
core or skeleton consisting of one or more sheets of canvas or other suitable
fabric.
Some bars of iron or steel may also be placed in the interior of the board or
slab, in order to increase its resistance to breaking or bending.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. Boards or slabs for building purposes, containing gypsum and spent dyewood
or tanner's bark, with or without the addition of glue, substantially as described.
2. Boards or slabs for building purposes.containing, in addition to gypsum, spent
dyewood or tanner's bark and a sheet or sheets of canvas or other textile fabric, or
some metal bars, substantially as described.
Dated this 9th day of December 1893.
FAIRFAX & WETTER,
433, Strand, London, Agents.