An Improved Compound for Plastering and for Preventing the Radiation and Transmission of Heat.
Year: 1886

page_text: Date of Application, 20th May, 1886.
Complete Left, 19th Feb., 1887.
Complete Accepted, 22nd Mar., 1887.
An Improved Compound for Plastering and for Preventing the
Radiation and Transmission of Heat.
I, RICHARD WILLIAM HITCHINS of 11, Lordship Road Stoke Newington in the
County of Middlesex Plasterer, do hereby declare the nature of this invention to be as
follows:-
My Invention relates to the manufacture of a new compound for plastering, for
covering boilers, lining safes, and other purposes.
The Invention consists essentially in mixing together about equal proportions of
slag-wool and plaster of Paris or cement in a dry state, whereby a compound is
produced which is ready for immediate use as required and which will produce a
plaster possessing fireproof and other qualities as hereafter described.
I propose to effect the mixture of the slag-wool and plaster or cement by means of a
machine similar to a carding-engine so that the ingredients shall become thoroughly
incorporated together. The compound is gauged by mixing it with water to which
acids or other ingredients of a nature to render the plaster harder and more fire
resisting may be added.
This improved compound is applicable for the various purposes of plastering by any
of the methods now in practice.
The advantages gained by the use of this compound are, that it is lighter than
ordinary plaster, will resist a greater amount of heat, and being more porous will
more effectually prevent the transmission of sound.
11
3011
1007
R. W. HITCHINS.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: I RICHARD WILLIAM HITCHINS formerly of 11 Lordship Road, and at present of
Park House Dynevor Road, Stoke Newington in the County of Middlesex, Plasterer,
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:-
My Invention relates to the manufacture of a new plastering compound applicable
for plastering work generally and also for covering boilers, lining safes, for preventing
the transmission or radiation of heat, and for other purposes.
The Invention consists essentially in mixing together about equal proportions of slag-
wool, (silicate cotton) and plaster of Paris or any cement generally used for plastering,
the plaster or cement being in a dry state, so as to form with the slag-wool a compound
which is ready for immediate use as required, and which when gauged will produce a
plaster possessing fire-proof and other qualities as hereafter described. I propose to
effect the intimate mixture of the slag-wool and plaster or cement by means of a
suitable tearing and mixing machine, which may be constructed of a pair of discs
studded with pins which intermesh and rotate in opposite directions (like a disin-
tegrator) so as to tear up the slag-wool and intimately mix it with the plaster, a sieve
being placed beneath which only allows that portion of the materials which have been
sufficiently reduced to pass through. Before passing to the mixing machine, the slag-
wool may be subjected to the action of a species of carding engine. The proportions
of the slag-wool to the plaster or cement necessarily varies according to the class of
work; for example, for pugging floors, the maximum of wool is desirable-say 70%
-for rendering and floating, and for the foundations of cornices, girder casings,
and plaster work generally 30% to 50% slag-wool and for finishing 30 % slag
wool which has, in this case, been passed through a very fine sieve. The dry compound
is gauged by mixing it with water to which may be added the ingredients generally
used for hardening plaster and cement.
This improved compound is applicable for the. various purposes of plastering by any
of the methods now in practice. The advantages gained by the use of this compound

page_text: are that it is lighter than ordinary plaster, will resist a greater amount of heat,
and, being more porous, will more effectually prevent the transmission of sound.
Having now particularly described and ascertained the nature of the said Invention,
and in what manner the same is to be performed, I declare that what I claim is ;-
A plastering compound for the purposes specified, consisting of a dry mixture of
slag-wool and plaster of Paris or cement, substantially as herein described.