The aim of this descriptive memorandum is the declaration of the
object whose exclusive industrial and commercial exploitation privilege we apply
for in all the States which are nowadays contrating parties in the Agreement of
Munich (5th October 1973) according to the rules contained in the prevailing Agreement
about the concession of European Patents.
The invention we are dealing with, and whose title is "JIGS FOR THE
LEARNING OF PROPORTION IN ARTISTING DRAWING", is meant to improve the already known
techniques, offering solutions which surpass the traditional ones, as we will
describe throughout this memorandum.
The goal of ths invention contents is the constitution of jigs which
facilitate the copy of drawings, figures...etc, on paper and different materails,
not only in full (normal) size, but also in other sizes, increased or reduced depending
on what you prefer. It's aimed to students and its use incorporates a pedagogical
baggage as we will describe throughout this memorandum.
To reach this objectives the invention makes use of two sets of jigs,
one of which we will call original jig and the other reproduc- tion jig. The original
jigs are transparent; i.e. made of plastic and have a series of lines, settings
and reference points which we will call "references", which are similar on the
The "references" on these "original" sheets may be printed to occupy
all of the surface of the sheet; i.e. there'll be graphic marks all over the surface
of the sheet; but they won't take up the whole surface providing for blank spaces
that will allow the student to make his own sketch of the model to draw. In any
case, the "references" may be varied and indeterminate in the way we will describe
below this specification.
The reproduction jigs consist of another set of sheets, either transparent
or not, e.g. made of plastic, also supplied in different sizes. They are similar
amongst themselves and to the original jigs. Each one of this jigs counts with
the same series of printed lines, reference points, settings and references as the
original jigs so that there is a matching reproduction sheet for each original
sheet; this being either of the same or different size.
The proper use of this jigs (for the learning of the technique of
proportion) involves the arrangement of one original sheet on the object to reproduce
when this object is defined on a plan e.g. on an original sheet so that its references
are superposed on the model.
A drawing paper is placed on the corresponding reproduction sheet
which shows a strong contrast between its colouring and the black reference lines
printed on it. Thus, these references can be clearly seen on the drawing paper.
The drawing paper will usually be ordinary paper, which enables the transfer of
the references to the drawing paper.
The student then proceeds to draw the figure of the model framed
in the original sheet with the aid of the lines, points of reference etc ... Also
printed on the reproduction sheet, which allow for an easier location of the details
When the object to draw is not printed and it's not possible to superpose
the original sheet, these are used with a frame whose correct positioning enables
to frame the model. In this case, the student will have to take his position of
obsever of the model as a reference for reproduction, in the way painters do when
framing the object to paint. To suitthis purpose, the reproduction sheet will
be transparent and perforated as described below.
In both cases, and on a higher level of difficulty, the sheets are
completed with other sets of jigs similar to the ones des- cribed; but with less
printed lines of references. These are aimed at progressive work with an increasing
level of difficulty for the stu- dent. I. E. the set is completed with other sets
of original jigs with a progressive diminution of the number of references, which
are always a part of the complete set both in shape and location, and which are
used as the student makes progress. The reproduction sheets are always provided
with the whole set of references.
When using these "greater difficulty" original jig, and once the
author has finished his work, he procedes to change this for the ordi- nary original
jig, of the same size and with all the printed referen- ces. Thus, he can carry
out a work of self-criticism, spotting any errors and concentrating his efforts
on their correction.
When the drawing has to be done on thick drawing paper which does
not allow for transparency, the reference lines can be drawn on this paper by means
of a perforated reproduction jig comprised in the set. This jig is transparent
and perforated at specific points of reference , wich enables to transfer them
to the drawing paper using a pencil with which we mark the reference points for
further complete of partial drawing of the reference lines.
We have so far described the following:
- 1- The "original sheets" which are transparent and have reference points, lines,
- 2- Other sheets called "reproduction sheets" with matching reference points,
lines, etc ... which are not transparent and on which the drawing paper is arranged
so that its reference lines show on the drawing paper.
- 3- A second type of reproduction sheets which are transparentand have perforated
reference points which allow for superposition on thick drawing paper on which
the reference points are marked with the help of a pencil used through the perforated
With regard to these perforated reproduction sheets, we have to point
out that key may be pierced only on a fourth or half of the area of the basic sheet,
depending on the symmetry (axis) with respect to a complete sheet of larger size,
usually twice to four times bigger than the standard sheet. By turning these sheets
once or twice on the side which constitutes the axis we can avoid the use of reproduction
sheets which are too big. The standard size ones can thus suit sizes twice or four
times bigger than the reproduction sheet.
In order to facilitate a better understanding of the features of
this invention, and as a means of illustration, we attach a sheet of drawings on
which the following are illustrated:
- Fig. 1 & 2 - Show two original sheets arranged on the model of the draw
each one of them corresponding to different levels of reference in accordance
with the invention.
- Fig. 3 - Shows a reproduction sheet, which can be larger, smaller or similar
to the original one, in accordance with the invention.
- Fig. 4 - Shows a drawing sheet on which we can see the reference lines on the
- Fig. 5 - Shows a transparent reproduction sheet on which angle, singular and
corner point have been marked and which will be conveniently perforated
The description of all these figures is in different sizes so as
to allow the student to reproduce the model in its original size or other sizes.
With reference to these drawings, we must first note the original
transparent sheet (1), which shows a number of references marked with lines (2),
points (3)-(3a)-(3b) ... etc which take up the sheet surface. This arrangement
provides the non-entire occupation of such surface. This original sheet is arranged
on the model to draw (4) (fig. 1st & 2nd).
The reproduction sheet (5) correspondin to fig. 3rd enables the student
to draw the strokes (7) corresponding to the work carried out from model (4) on
the drawing sheet (6) fig. 4, arranged on the reproduction sheet.
As it was formerly mentioned, the drawing sheet (6) will enable the
student to see the refernces lines on the reproduction sheet, making it clear again
that in case of thick drawing paper, we can supply sheets with the reference sheets
already printed (same as the reproduction sheet) (5) or transparent reproduction
sheet (8) (fig. 5), with a number of perforations (9) which would allow for marking
on the thick drawing sheet.
In this figure 5, we can clearly appreciate the points which can
be perforated, which are those of position (10), twelve angular points, those of
position (11), four singular points, those of position (12) four singular points
and those of position (13), four points on the sheet outer apices. We insist again
that the references lines on the original sheet and the reproduction sheet will
be provided with large blank spaces so as to stimulate the student's creativity.
In addition to that, we will also supply other sheets, both original and reproduction,
with greater difficulty, where part of the reference lines on the basic sheets
It's worthwhile emphasizing, once its nature and advantages have
been described, the non-restrictive character of this invention and so the changes
in shape, material or size of its constituent parts will not alter its essence
at all, as long as they don't entail a significant variation in the set.
Likewise, the applicant, sticking to the International Agreements
on Industrial Property certifies his right to the extension this application to
foreign countries, claiming its priority.
The inventions, which imply novelty and stand to obtain the european
patent, will have to fall to JIGS FOR THE LEARNING OF PROPORTION IN ARTISTIC DRAWING,
in accordance with the following: