An Improved Drawing Apparatus.
Year: 1892

page_text: Date of Application; 28th Jan., 1892
Complete Specification Left, 28th Oct., 1892-Accepted, 28th Jan., 1893
PROVISIONAL SPECIFICATION.
An Improved Drawing Apparatus.
We ROBERT BARKOWSKI and JACOB BONN Engineers both of 60 Finsbury
Park Road N. in the County of Middlesex do hereby declare the nature of this
invention to be as follows:-
This invention relates to and is connected with drawing instruments and its
purpose is to enable and facilitate the instrument drawing in books or on single
sheets where the common drawing board and T square cannot be brought into use.
It is also for aiding the freehand drawing in a manner hereafter described.
We provide a base plate of thin wood, metal or cardboard or any other suitable
material to a desired size; which if made of flexible material may be stiffened
against bending by metal ribs or edges.
On the flat side of one edge is a cross bar adjusted which is either quite removable
or provided with a mechanical arrangement in such a way that a sheet of paper
either loose or forming part of a book may easily be slipped between the base plate
and the cross bar.
By means of springs screws bolts or other arrangements the cross bar is tightly
secured to the base plate and thereby keeping the paper between it in its proper
position.
The cross bar in such a position is at the same time used as a guide for setsquares
or rules.
The described base plate is preferably larger than the drawing paper to be used
and its edges being marked with divisions will consequently extend and be visible
when the paper held between bar and base is resting on the latter.
The above described cross bar may also be provided with divisions thus greatly
facilitating any desired divisions on the paper to be drawn on as an aid to either
instrumental or freehand drawing.
The empty space of the base plate may be used for printed matter viz. designs,
tables, instructions or advertisements.
For special purposes the cross bar may be constructed without the base plate but
with a narrow connection only enabling it to be secured to the paper in a manner
before described.
Dated this 27th day of January 1892.
КОБЕКТ БАЛЛОН SAI.
JACOB BONN.
COMPLETE SPECIFICATION.
An Improved Drawing Apparatus.
We ROBERT BARKOWSKI of 55 Grafton Street Fitzroy Square and JACOB
BONN of 11 Elms Grove Hammersmith Engineers both residing in the County of
Middlesex 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 and is connected with drawing instruments and its
purpose is to enable or facilitate instrumental or mechanical drawing in books and
on single sheets and to aid all kinds of freehand drawing in a manner hereafter
described.
We provide a base plate of thin wood cardboard, metal or other suitable material

page_text: to draw on and if made of flexible material it is stiffened against bending by metal
ribs.
On the flat side of one edge of the described base plate a cross bar is arranged
which is either quite removable or hinged on the base plate in such a manner that
a leaf of a drawing book or a sheet of paper may easily be slipped between the cross
bar and baseplate.
By means of springs screws or bolts the crossbar is pressed against the baseplate
and secures the drawing paper tight against it.
The cross bar in such a position may be used at the same time as guide or rest
for set squares and rules.
The cross bar may also be made of such shape that the top side of it forms a
groove or a rib; a piece of metal fitting in that groove or over that rib is attached
to a rule which is then transformed to a T square and may be slided up and down
to suit the requirements of the drawing.
The edges of the above described baseplate crossbar and T square may be
marked with equal divisions; and as these divisions are visible when the paper is
held between the crossbar and baseplate they will greatly facilitate the dividing of
the paper to be drawn on into divisions of desired sizes, thus aiding all kinds of
drawing mechanical or freehand.
The other space of the baseplate may be used for printed matter, instructions,
tables designs or advertisements.
The described crossbar may as well be used without the baseplate; in such cases
it is attached to a narrow strip of metal and may then be pinned or otherwise fixed
to an ordinary drawing board and the T squares and rules used in the same manner
as described.
Fig. I of the attached drawing shows the whole apparatus. a is the base plate
with its divisions partly covered by a sheet of paper a. a.
b is the cross bar bolted
on the latter. c. is a rule attached to a sliding piece d.
Fig. II. shows the section of Fig. I from to c. in an enlarged scale. It shows
the working of the sliding piece and a bolt e which secures the cross bar against
the base plate.
Fig. III is a section showing part of Fig. I from 1 to 2. in an enlarged scale.
f. are springs or pins tightening the paper against the baseplate.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :
I. A base plate for a drawing apparatus with divisions round its edges and
stiffened with metal ribs as described.
II. A cross bar with means of attachment to either baseplate or to an ordinary
drawing board with or without rib or groove for sliding T square as described.
III. The combination of a drawing apparatus consisting of a base plate, cross
bar and rule with slide as described.
Dated this day of 28th October 1892.
ROBERT BARKOWSKI.
JACOB BONN.