Improvements relating to Plastering Material or Compositions.
Year: 1890

page_text: Date of Application, 25th Feb., 1890-Accepted, 17th May, 1890
COMPLETE SPECIFICATION.
Improvements relating to Plastering Material or Compositions.
I, GEORGE WEST, of the City of Syracuse, in the County of Onondaga, in the
State of New York, United States of America, Manufacturer, do hereby declare the
nature of my 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 pertains to the class of compounds which are mixed with plastering
material and other mineral cements used for various architectural purposes, said
compounds being usually designed to retard the setting of the plaster and to improve
its adhesive and cohesive qualities.
The object of my present invention is chiefly to impart to the plastering material
or mineral cement a consistency which allows it to be more easily worked under the
trowel or modelling tool, and also capable of withstanding the changes of temperature
and thus adapt it to be used on the exterior as well as on the interior of buildings.
And to that end the invention consists of a compound composed of the following
ingredients in about the proportions specified.
When the material with which my compound is mixed is designed to be used as a
base coat for plastering the walls and ceilings of buildings, I form the compound of
two parts of glue, two or three parts of dextrine, and when desired also two parts of
carbonate of soda or sulphate of soda the latter retaining for some time the moisture
and being therefore preferred in dry weather. The glue I dissolve in water taking
about six parts of water to two parts of glue and at the same time add thereto the
carbonate of soda or sulphate of soda. This solution I mix with about twenty parts
of dry mineral absorbent such as whiting, or clay, or plaster of Paris, or marble dust
or other similar dry pulverized mineral, and then add and thoroughly intermix there-
with the aforesaid quantity of dextrine. Said compound is designed to be used with
plaster of Paris, sand, talc, soap stone and marble dust in plastering the walls
and ceilings of buildings, making wall mouldings and cornices and other analogous
purposes.
When used for what is termed in plastering the "scratch coat " I take about one
pound of the compound and mix it thoroughly by the ordinary and well known means,
with about thirteen pounds of plaster of Paris or equivalent material and about sixty
pounds of sand.
When what is termed in plastering the "finishing coat" is desired I add one pound
of the compound to the same quantity of plaster as when a scratch coat is required
but in place of the sand I use about twenty-two pounds of marble dust, tale or
soap-stone.
The office of the glue is to retard the setting of the plaster, and any other well
known retarder such as molasses, or acids may be used in place of it.
For working on the exterior of buildings I add to the aforesaid compound before
mixing it with the cement or plastering material, about two pounds of boracic acid,
which imparts a greasy or unctuous character to the said cement or plastering
material.
When it is desirable to render the cement or plastering material very hard when
set I substitute about six pounds of alum or saltpeter for the dextrine and the quality
of the compound may be further improved by adding thereto from two to six pounds
of oil preferably lard oil or cotton seed oil.
The aforesaid compound with or without the alum and oil I dry and then pulverize
it preparatory to mixing it with the cement or plaster.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
--
First. The admixture of glue and carbonate of soda or sulphate of soda with
plastering material, as set forth.
Second. The admixture of glue, carbonate of soda or sulphate of soda and alum
with plastering material for the purpose set forth.
Third. The admixture of glue, carbonate of soda or sulphate of soda alum and oil,
with plastering material, as and for the purpose set forth.
Fourth. The admixture of glue, carbonate of soda and boracic acid with plastering
material, as and for the purpose described.
Fifth. The admixture of glue, carbonate of soda and dextrine with plastering
material as set forth.
Sixth. The admixture of glue, carbonate of soda, boracic acid and dextrine with
plastering material as set forth.
Dated this 4th dox of Fo1900
Haseltine, Lake & Co.,
GEORGE WEST.
45, Southampton Buildings, London, W.C., Agents for the Applicant.