A New or Improved Material for Covering Walls and Roofs.
Year: 1898

page_text: Date of Application, 27th Jan., 1898-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
A New or Improved Material for Covering Walls and Roofs.
I, PAUL LEHMANN, of No. 41, Prinzen-Strasse, Berlin, Germany, Merchant, 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 present invention relates to the manufacture of a material for covering walls
and roofs, which material is almost untearable, and perfectly storm and fire-
proof. It is intended to be a substitute for the known "carton-pierre," but com-
pared with the latter it has this advantage, that it can be made to any colour,
which is of considerable importance, because if used in light colour for roofing it
reflects the sun-beams and the rooms underneath it are kept cool. Because of its
durability and its being weatherproof it can be used with advantage for steep
roofs, especially for covering vertical surfaces (gable walls) because it needs no
tar coating such as there is on "carton-pierre" which requires to be renovated
repeatedly. The substances the material is coated with, do not melt in great heat
but the material is very flexible until it is applied, while its degree of hardness
and weather-proofness increases the longer it is exposed to the weather.
By boiling a mixture composed of linseed oil and silver litharge a varnish is
obtained in which strips of jute-linen are steeped and afterwards allowed to dry.
But according to the purpose for which the prepared material is to be used, board,
made of leather parings may be employed instead of the jute-linen, the board
being steeped in hot-india-rubber varnish which is prepared by dissolving finely
cut caoutchouc in boiling linseed oil.
After drying these pieces each of the strips of jute-linen or board thus prepared
are given a flexible coating preferably by means of a brush.
The coating material is prepared of the following ingredients used in or about
the proportions stated:-
One part of whitening.
One part of finely washed earth colour,
Three parts of silver litharge,
Five parts of linseed oil varnish.
While the coating is wet, the outer side of the strip is strewn over with ground
sand stone, and the inner side with ordinary sand. The reason of the difference
of the strewing material is to render the upper surface readily distinguishable
from the lower surface.
The material is then allowed to dry, and after this, or if desired after it has
been fixed at its destination, the stone-like coating is painted over with oil-paint
of any colour. The paint in combination with the close but flexible stone-under-
ground and the peculiar constituents (steeped jute-linen or board made of leather
parings) which are themselves suitably prepared, form a material for covering
walls and roofs which possesses the aforementioned advantages over the materials
at present used for the same purpose. Silver litharge is a fused crystalline lead
oxide, and is obtained as a bye-product of the separation of silver. from lead.

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:-
A material for covering walls and roofs, made of jute steeped in a mixture
obtained by boiling linseed oil and silver litharge, or of board made from leather
parings and steeped with a varnish consisting of caoutchouc dissolved in boiling
linseed oil, the pieces thus prepared being, after they have become dry, treated
with a mixture of whitening, silver litharge, washed earth colour, and linseed oil
varnish in order to, while wet, enable them to be closely strewed on the one side
with ground sand stone and on the other with sand, and afterwards to be coated on
the outside with oil-paint substantially as and for the purpose set forth.
Dated this 27th day of January 1898.
G. D. HOWARD,
Of the Firm of Hughes, Son & Co.,
38, Chancery Lane, W.C., Agent for the Applicant.