Year: 1888

page_text: Date of Application, 17th Jan., 1888
Complete Specification Left, 3rd Oct., 1888
Complete Specification Accepted, 9th Nov., 1888
I HARRY GEORGE GEAR of No. 7 North View Vicarage Road King's Heath in
the County of Worcester Commercial Traveller do hereby declare the nature of this
invention to be as follows:-
The wood laths commonly used in plastered structures consist of flat strips of wood
fastened parallel to one another and at a short distance apart on the ceiling or other
structure to be plastered. The longitudinal edges of the said ordinary laths are flat
that is are at right angles to the top and bottom faces of the laths and in order to
obtain the desired hold of the plaster or plastering material upon the laths it is
necessary to press a considerable quantity of the plaster between the adjacent edges of
the laths so that the said plaster will spread over the said edges and pass to and take
upon the backs of the said laths.
a hold
This invention consists in forming the longitudinal edges of the wood laths in the
manner herein after described whereby a perfect hold for the plaster or plastering
material is obtained without the necessity for pressing portions of the plaster to the
backs of the laths and consequently a considerable saving in the quantity of the plaster
used is effected.
Instead of making the longitudinal edges of the wood laths flat as heretofore this
invention consists in making in each of the longitudinal edges of the laths a groove
having preferably a V or dovetail figure but the figure of the groove may be varied
for example it may be rectangular or semi circular or semi elliptical but it is preferred
as before stated to make the groove of a V or dovetail figure as that form of groove
can be readily planed cut or fashioned in the edges of the lath.
When the grooved laths described are used in a structure to be plastered the plaster
in filling the spaces between adjacent laths also passes into and fills up the grooves in

page_text: the edges of the laths. A hold for the plaster is thereby obtained along the whole
length of each of the longitudinal edges of the adjacent laths and hence a very perfect
hold of the material is obtained without the necessity for the plaster being pressed to
the backs of the laths as is required when ordinary laths are used and a considerable
saving of material is thereby effect as before stated.
Dated this Seventeenth day of January. 1888.
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Wood Laths Used in Plastered Structures.
1 HARRY GEORGE GEAR of No. 7 North View, Vicarage Road, King's Heath in
the County of Worcester, Commercial Traveller, do hereby declare the nature of the
said Invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
The wood laths commonly used in plastered structures consist of flat strips of wood
fastened parallel to one another and at a short distance apart on the ceiling or other
structure to be plastered. The longitudinal edges of the said ordinary laths are flat,
that is, are at right angles to the top and bottom faces of the laths and in order to
obtain the desired hold of the plaster or plastering material upon the laths it is
necessary to press a considerable quantity of the plaster between the adjacent edges of
the laths so that the said plaster will spread over the said edges and pass to and take
a hold upon the backs of the said laths.
This invention consists in forming the longitudinal edges of the wood laths in the
manner hereinafter described and illustrated in the accompanying Drawing, whereby
a perfect hold for the plaster or plastering material is obtained without the necessity
for pressing portions of the plaster to the backs of the laths and consequently a
considerable saving in the quantity of the plaster used is effected.
Instead of making the longitudinal edges of the wood laths flat as heretofore this
invention consists in making in each of the longitudinal edges of the laths a groove
having preferably a V or dovetail figure but the figure of the groove may be varied ;
for example, it may be rectangular or semi-circular or semi-elliptical but it is preferred
as before stated to make the groove of a V or dovetail figure as that form of groove
can be readily planed, cut or fashioned in the edges of the lath.
Figure 1 of the accompanying Drawing represents partly in side elevation and
partly in longitudinal section and in cross section, a wood lath provided with V shaped

page_text: grooves in its longitudinal edges according to this Invention, the said V shaped grooves
being marked a, a.
Figure 2 represents in cross section a wood lath having dovetail grooves in its
longitudinal edges according to this invention, the said dovetail grooves being
marked b, b.
Figure 3 represents in cross section a wood lath having rectangular grooves in
its longitudinal edges according to this invention the said rectangular grooves being
marked c, c.
Figure 4 represents in cross section a wood lath having semi-circular grooves in
its longitudinal edges according to this invention the said semi-circular grooves being
marked d, d.
Figure 5 represents in cross section a wood lath having semi-elliptical grooves in
its longitudinal edges according to this invention, the said semi-elliptical grooves
being marked e, e.
When the grooved laths described and illustrated are used in a structure to be
plastered, the plaster in filling the spaces between adjacent laths also passes into and
fills up the grooves in the edges of the laths. A hold for the plaster is thereby
obtained along the whole length of each of the longitudinal edges of the adjacent
laths and hence a very perfect hold of the material is obtained without the necessity
for the plaster being pressed to the backs of the laths as is required when ordinary
laths are used and a considerable saving of material is thereby effected as before
stated.
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 I claim
as the said invention of "An improvement in wood laths used in plastered
structures"
Making in each of the longitudinal edges of the laths a V or other shaped groove
into which grooves the plaster or plastering material passes and by which they are
filled or partially filled, thereby obtaining a very efficient hold for the plaster or
plastering material along each of the longitudinal edges of the laths substantially as
herein before described and illustrated in the accompanying Drawing.
Dotad this Winst dar of Ontahan 1900