Improvements in Metallic Lathing.
Year: 1889

page_text: Date of Application, 14th May, 1889-Accepted; 15th June, 1889
Improvements in Metallic Lathing.
I JOHN MAW, of 63 Queen Street North, Hamilton, Ontario, Canada, Manufacturer,
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 metallic lathing and is designed to improve the construction
of the same.
In the accompanying drawing I have shown how my said invention may be con-
veniently and advantageously carried into practice.
Figure 1 is a plan showing a portion of a sheet of metal formed into lathing.
Figure 2 is a transverse section on the line a, a Figure 1.
Figure 3 is a side elevation drawn to an enlarged scale.
Figure 4 is a plan, and
Figure 5 is a transverse section on the line y, y Figure 4 also drawn to an
enlarged scale showing a portion of the said lathing with the motar or plaster applied
thereto.
Like letters indicate corresponding parts throughout the drawing.
A is a sheet or plate of metal provided with corrugations A and with longitudinal
slits or slots B. The strips or portions of the sheet or plate A thus partially detached,
are alternately bent or curved in different directions or raised and depressed as more
clearly shown in Figure 3. CC are holes for attaching the said metallic lathing to
the joists or other suitable supports.
It will be seen by referring to Figure 4 that mortar or plaster applied to this
lathing will be deflected by the curve of the face of the corrugations of the raised
or elevated strips or portions and thus caused to bind behind the convex surfaces at
the rear of the depressed or elevated strips or portions thus effectually keying the
said plaster in position and rendering accidental removal thereof extremely
difficult.
The form of the said metallic lathing moreover, that is to say, the corrugated
strips alternately bent or curved in different directions renders the said sheet or plate
of metallic lathing very rigid and obviates or reduces to a minimum any chance of
the unsightly cracking of the plaster applied thereto so common in ceilings or other
plastered surfaces where ordinary lathing is employed.
Mortar in itself forms a preventative of rust and tends to preserve the said
metallic lathing.
In some cases moreover I galvanize my improved metallic lathing or coat or cover
it with ashphaltum or any other suitable composition to prevent rust.
Metallic lathing constructed according to my invention is of a very efficient
description and can be moreover manufactured at a very low cost. Owing to its
superior keying properties ordinary mortar may be advantageously employed merely
faced when necessary with plaster thus creating a very considerable saving in material.
Moreover my improved metallic lathing is fire-proof thus adding very considerably to
the safety of a building in which it is employed.
Although I have herein before described the mortar or plaster as preferably applied
from the side of the said metallic lathing presenting the concave sides of the corrugated
strips or portions it is obvious that it might in some cases be applied from the other
or convex sides thereof.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I wish it understood that
I claim
The corrugated metallic lathing having the slits or slots and the alternate raised and
depressed portions, substantially as, and for the purposes, hereinbefore described.
Dated this 14th day of May 1889.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.