An Instrument or Appliance for Facilitating the Sketching or Composition of Designs.
Year: 1892

page_text: Date of Application, 18th June, 1892-Accepted, 23rd July, 1892
COMPLETE SPECIFICATION.
An Instrument or Appliance for Facilitating the Sketching or
Composition of Designs.
I, WALTER STRANDERS of 123 Park Road, Crouch End, in the County
of Middlesex, Draughtsman and Designer, 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 or appliance for facilitating the sketching
or composition of designs for various purposes, particularly designs of a more or
less geometrical or regular character produced by the multiplication of the same or
similar elements arranged about a common centre.
The instrument or appliance consists of a transparent disc having a surface
capable of being drawn upon and fitted within a circumferential frame or otherwise
adapted to revolve about its centre in combination with a subjacent templet or
diagram having circles, straight and curved lines, and graduations or divisions,
marked upon it whereby to facilitate the inscription upon the transparent disc of
the divisions and lines necessary for the production of the various elements of the
desired design.
In order to avoid the confusion which would necessarily arise by the multiplica-
tion upon the subjacent templet of a large variety of divisions, lines, and elements,
but one of each variety is given the desired multiplication being obtained by the
circular adjustment of the transparent drawing disc for each repeat of the same
graduation, division, line, or element, but for still greater variety the same drawing
disc may be used in conjunction with more than one templet.
One convenient form of templet for use as a basis for various designs is marked
with a circle concentric with the drawing disc, and with lines forming chords thereto.
of different lengths, and radii at various angular distances, such chords and radii
corresponding to the division of the circle into different numbers of aliquot parts so as
to guide the designer in the successive adjustments of the rotary drawing disc, and also
with curvilinear and other lines, adapted by successive repetition at each step in the
rotation of the drawing disc to form the outlines of elements of a design of regular
or irregular character at the will of the designer.
cross-section thereof.
In the accompanying drawings, forming part of this Specification, Figure 1 is a
face view of the designing instrument or appliance part of the transparent drawing
is a diametrical
dise being broken away to shew the templet beneath, and Figure
A is the transparent drawing disc of roughened glass or other equivalent medium
for drawing upon, enclosed within a frame B of cardboard or other material, and
C is a templet such as above referred to.
The figures indicate the number of aliquot parts into which the circle may be
divided by taking the lengths of the chords numbered from 3 to 12 or by taking
the angular distances of the various radial graduations (numbered 13 to 24) from
the diametrical line.
The chords 3 to 12 also serve as guides in drawing the sides of regular polygonal
figures, whilst the purpose of the radial and curvilinear lines will be sufficiently
evident.
It will of course be understood that the relative rotation of the drawing disc
with regard to the templet might be obtained by rotating the templet beneath a
stationary transparent drawing surface.
By drawing on the disc A with a soft pencil, transfers may be readily obtained
therefrom

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is--
The herein described designer's appliance, consisting in the combination of a
transparent drawing surface and of a templet or diagram substantially as described
and adapted to be adjusted circularly, the one with regard to the other, substantially
as and for the purpose specified.
Daire une 10111 1094.
W. STRANDERS,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.