Improvements in Metallic Lathing and in the Application thereof to Ceilings and the like.
Year: 1889

page_text: Date of Application, 6th June, 1889
Complete Specification Left, 5th Apr., 1890-Accepted, 10th May, 1890
PROVISIONAL SPECIFICATION. ·
Improvements in Metallic Lathing and in the Application thereof
to Ceilings and the like.
We, CHARLES JOHN DORMER ANDREWS, of 20 Bucklersbury in the City of
London, Solicitor and JOHN STEWART WALLACE of Cliftonville Avenue, Belfast, in
the County of Antrim, Ireland, Timber Merchant, do hereby declare the nature of
this invention to be as follows:―
Our invention relates to metallic lathing, that is to say, to metallic surfaces
employed in the place of ordinary wood lathing on which to place mortar, plaster or
the like for forming ceilings, partitions or other plastered surfaces.
Wire netting has been sometimes employed for this purpose but its use presents
many disadvantages amongst others by reason of its lack of stiffness and the con-
sequent difficulty in getting a perfectly plain or level surface. It has moreover been
found that the said wire being fastened to the joists or rafters and touching the latter
throughout its entire length has been the means of communicating heat to the said
joists or rafters and thereby giving rise to danger from fire.
Our invention is designed to obviate these defects, and to provide improved means
for fastening the sheets of wire netting or other suitable material to the said joists or
rafters, and moreover to enable the plaster or other material to key more readily to
the same.
In carrying our said invention into practice we employ wire netting or its
equivalent as a basis for the plaster pulp or other suitable material, and we form
corrugations at suitable intervals on either or both sides of the said netting in order
to stiffen or strengthen the same. At suitable intervals in the said corrugations we
Sometimes form further depressions, so that when. the wire netting is fixed to the
joists or rafters it will only touch at these points throughout its length and not
elsewhere. In some cases we provide nails, staples or the like and to prevent the wire
from touching all along its surface, we round the said nails or staples and secure
washers made of metallic or other fire resisting material.thereto.
Or we let into the corrugation a suitable metal wire attached in any convenient
manner to the netting, the extremities of which project beyond the said netting on
either side. The said extremities are preferably bent at right angles and sharpened,
so that the said netting may be attached. to the joists or rafters. To prevent the said
netting from touching the said joists or rafters throughout the whole of its length we
may employ as hereinafter mentioned fire proof or other washers.
1.
1.
In order to cause the material used for plastering to key more readily to the said
lathing we sometimes roughen the wire of which the said netting is composed or, we
employ at the edges er elsewhere barbed wire to prevent the plaster, mortar or other
material from breaking away from the said edges. The said wire netting may be in
the form of sheets or webs as desired.
Instead of the above mentioned wire netting, we employ in some instances perforated
sheet metal or thin sheets of malleable cast iron or other suitable material either with
or without corrugations, and we may employ with these sheets, nails or staples as
above described or any other suitable device for enabling them to be fixed to the joists
or rafters.
When we use pulp or like substance in place of plaster, we sometimes. make it fire
proof by any well-known or other suitable process.
Dated this 6th day of June 1889.

page_text: netting from touching the said joist or rafter throughout the whole of its length, we
may employ as hereinbefore mentioned fire proof or other washers D.
In order to cause the material used for plastering to key more readily to the said
lathing we sometimes roughen the wire of which the said netting is composed, or we
employ at the edges or elsewhere barbed wire A³, as shown in Figure 5, to prevent
the plaster, mortar, or other material from breaking away from the said edges. The
said wire netting may be in the form of sheets or webs as desired.
Instead of the above mentioned wire netting we employ in some instances perforated
sheet metal or thin sheets of malleable cast iron or other suitable material, either with
or without corrugations, and we may employ with these sheets nails or staples as above
described or any other suitable devices for enabling them to be fixed to the joists, rafters
or other surface.
When we use pulp or like substance in place of plaster we sometimes make it fire
proof by any suitable process.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we wish it understood
that we claim :-
The improvements relating to metallic lathing substantially as and for the purposes
1 this 5th day of April 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicants.