Improvements in Draughtsmen's Squares, Rules, and Curves.
Year: 1894

page_text: Date of Application, 12th Sept., 1894
Complete Specification Left, 12th June, 1895-Accepted, 13th July, 1895
PROVISIONAL SPECIFICATION.
Improvements in Draughtsmen's Squares, Rules, and Curves.
We, SYDNEY WILLIAM WILKINSON, of 6 Crookes Place, Engineer, and
ROBERT FRANCIS DRURY of George Street, Patent Agent, both in the City of
Sheffield do hereby declare the nature of our invention to be as follows:-
"
Our invention has for its object to construct such squares, rules, curves, and
analogous instruments so as to avoid "smudging or otherwise defacing or dirtying
the pencil or ink lines of drawings, diagrams, lines or the like by raising the flat
side or sides or edges of such ruling instrument above the surface of the paper, and
also forming means by which the fingers are enabled to readily move the instrument
from one position to another as desired.
It consists in producing projections or (a single projection if desired) upon the
flat side or sides of the instrument, preferably in the form of half balls or beads,
and arranged in a line at a convenient distance from the edge or edges.
When the material is suitable for the purpose we prefer to make the projections
by indenting one side, and thus forcing the material to the desired shape upon the
opposite side, and we prefer to produce the projections alternately on each side.
Thus on a square such as a tri-square projections would be formed upon both
sides round the edges, but on a straight rule a row of such projecting beads would
be made down the centre longitudinally, or two rows near the edges.
We may instead of round beads, make them elongated, or even one long
corrugation or rib.
automba 1901
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.
Improvements in Draughtsmen's Squares, Rules, and Curves.
We SYDNEY WILLIAM WILKINSON, of 6 Crookes Place, Engineer, and
ROBERT FRANCIS DRURY, of George Street, Patent Agent, both in the City of
Sheffield, do hereby declare the nature of this invention and in what manner the
same has to be performed, to be particularly described and ascertained in and by
the following statement :-
Our invention has for its object to construct draughtsmens squares, rules, curves
and other analogous drawing instruments, so as to avoid smudging, or otherwise
defacing, disfiguring, or dirtying, drawings plans or the like, and to enable the edge
of such rule or square to be passed over a wet ink line without coming in contact
with it.
The nature of the invention and the way in which it is carried into effect is shown
in the annexed sheet of drawings.
Fig. 1, represents an ordinary rule or straight edge constructed according to our
invention.
Fig. 2, represents a tri-square made according to our invention.

page_text: Fig. 3, shows a similar square with a modified form of projection.
Our invention consists in producing a large or small number of projections upon
oue or both sides of the instrument, such projections being of any suitable shape,
but preferably in the form of half balls or elongated beads and arranged in a line
at a convenient distance from the edge or edges of the square or rule.
In Fig. 1 we show the improvement as applied to a rule, the projections P, being
made upon
both sides of the rule, and in the form of half a sphere.
When the material is suitable for the purpose we prefer to make the projections
by the method of indentation upon the opposite side of the article, and thus forcing
out the material to the desired shape. Zylonite and celluloid are very suitable
materials for the purpose, the projections P, being readily raised upon one side by
making an-indentation 1, in the opposite side of the rule or square, by means of a
punch and die.
The Fig. 2, 'shows similar projections P, and indentations I, formed round, the
edges of a tri-square on both its sides.
In Fig. 3, we show an elongated or beadlike projection, produced in a similar
manner, and these beads may be of any length.
In a straight rule as shown in Fig. 1, a single row of projections may be made
down the centre. longitudinally, enabling either edge to be tipped up from the
paper.
In the case of wood squares or rules the projections may be formed by means of
attached studs either driven into the wood or affixed thereto by adhesive material
or otherwise..
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. A draughtsman's square, rule, or curve, having projections P, formed upon
one or both sides, for the purpose specified and substantially, as shown in the
annexed drawings.
2. A draughtsman's square, rule, or curve, having projections or studs affixed
upon one or both of its sides, as hereinbefore described, for the purpose specified.
Dated the 11th day of June 1895.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.