Improvements in Drawing and Measuring Instruments.
Year: 1894

page_text: Date of Application, 17th May, 1894
Complete Specification Left, 16th Feb., 1895-Accepted, 23rd Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Drawing and Measuring Instruments.
I, PETER KNOBEL, of Flums, Switzerland, Manufacturer, do hereby declare
the nature of this invention to be as follows:-
This invention relates to an instrument that can be used simply as a ruler or
may be provided with a scale or scales so as to be also usable as a measuring
appliance. It consists of a bar of metal (conveniently iron) of peculiar shape in
cross section, the two longitudinal edges being formed by beading or raising them
in channel-fashion.
This form imparts to the instrument a considerable capacity for resisting
flexure, with small weight, and also allows of its being employed in considerable
lengths.
It also provides two surfaces inclined towards the drawing surface and on which
scales may be arranged in such a manner as to abut directly on to the drawing
surface thereby ensuring great accuracy in setting off measurements.
The flat strip situated between the two raised edges of the instrument may
also be provided with a scale which is effectively protected against wear by
friction on rough surfaces by means of the said raised sides or.
edges. The said
scale may be in the form of perforations which will allow of a convenient setting
off of the divisions of the scale by the insertion of a pencil or drawing needle
therethrough.
In practice it will be preferable to arrange these perforations to a large scale
only, whilst the scales on the inclined edges of the rnler may be divided according
to the smallest measurements usually employed for drawing purposes, for instance
into half millimetres, so that the two scales supplement each other. A scale
divided by means of perforations is sufficiently accurate for use by joiners,
carpenters, stone-masons &c.
One arrangement according to my invention is illustrated in plan in Fig. 1, and
in cross section in Fig. 2 of the accompanying drawings. The two raised or
beaded edges a have a shape such that the flat strip b situated between them is
brought as close as possible to the drawing surface, upon which the outer edges
of the instrument rest so as to prevent any appreciable error. arising should
the pencil or drawing needle be passed obliquely through the perforations in said
strip.
In the arrangement shown in the drawing, units such as centimetres are indicated
by slots, and the halves of units are marked by small round holes. Of course any
other system of measurement may be employed in place of the metrical system
shown. The two inclined edges of the instrument may, as indicated on one side
in Fig. 1, be divided into scales of any desired degree of minuteness, which will
ensure great accuracy in setting off the measurements, because the dividing lines
abut directly on to the drawing surface.
Instruments of considerable length may be made of metal of the peculiar cross
section shown, by arranging a number of lengths in a telescopic manner.
Dated this 17th day of May 1894

page_text: Improvements in Drawing and Measuring Instruments.
I, PETER KNOBEL of Flums, Switzerland, 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 :-
This invention relates to an instrument that can be used simply as a ruler or
may be provided with a scale or scales so as to be also usable as a measuring
appliance. It consists of a bar of metal (conveniently iron) of peculiar shape in
cross-section, the two longitudinal edges being formed by beading or raising them
in channel-fashion.
This form imparts to the instrument a considerable capacity for resisting flexure,
with small weight, and also allows of its being employed in considerable lengths.
It also provides two surfaces inclined towards the drawing surface and on which
scales may be arranged in such a manner as to abut directly on to the drawing
surface thereby ensuring great accuracy in setting off measurements.
The flat strip situated between the two raised edges of the instrument may
also be provided with a scale which is effectively protected against wear by
friction on rough surfaces by means of the said raised sides or edges. The said
scale may be in the form of perforations which will allow of a convenient setting
off of the divisions of the scale by the insertion of a pencil or drawing needle
therethrough.
In practice it will be preferable to arrange these perforations to a large scale
only, whilst the scales on the inclined edges of the ruler may be divided according
to the smallest measurements usually employed for drawing purposes, for instance
into half millimetres, so that the two scales supplement each other. A scale divided
by means of perforations is sufficiently accurate for use by joiners, carpenters,
stone-musons &c.
In the drawings left with my Provisional Specification, Fig. 1 is a plan anl
Fig. 2 a cross section showing a drawing and measuring instrument according to
this invention.
The two raised or beaded edges a have a shape such that the flat strip b situated
between them is brought as close as possible to the drawing surface, upon which
the outer edges of the instrument are adapted to rest so as to prevent aur
appreciable error arising should the pencil or drawing-needle be passed obliquely
through the perforations in the said strip.
In the arrangement shown in the drawings, units such as centimetres are indicated
by slots, and the halves of units are marked by small round holes. Of course any
other system of measurement may be employed in place of the metrical system
shown. The two inclined edges of the instrument may, as indicated on one side
in Fig. 1, be divided into scales of any desired degree of minuteness which will
ensure great accuracy in setting off the measurements, because the dividing lines
abut directly on to the drawing surface. Instruments of considerable length my
be made of metal of the peculiar cross section shown, by arranging a number of
lengths in a telescopic manner.
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 ruler consisting of a metal bar the form of which in cross section is that of
upwardly inclined undulating or bulging prominences with an intermediate flat
recessed middle portion substantially as described and shown, whether or not its

page_text: recessed flat middle portion, or one or each of its inclined edge surfaces, be provided
with a scale as set forth.
Dated this 16th day of February 1895.
Than the Anationt
the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.