IMPROVEMENTS IN DRAWING APPARATUS
Year: 1877

page_text: LETTERS PATENT to William Henry Barlow, of 2, Old Palace Yard, in the
City of Westminster, for the Invention of "IMPROVEMENTS IN DRAWING
APPARATUS."
Sealed the 11th January 1878, and dated the 20th November 1877.
PROVISIONAL SPECIFICATION left by the said William Henry Barlow at the
Office of the Commissioners of Patents on the 20th November 1877.
WILLIAM HENRY BARLOW, of 2, Old Palace Yard, in the City of Westminster.
"IMPROVEMENTS IN DRAWING APPARATUS."
This Invention has for its object to control the irregularities produced in the
breadth and steadiness of lines drawn with small brushes, termed pencils, or other
elastic pens, when held in the hand. It consists of a holder made of metal or other
suitable material, in which the pencil is firmly fixed, and from which proceed one
or more projections or supports which touch the paper or surface to be drawn upon
so as to prevent the pencil or pen from being pressed beyond certain limits. The
instrument may be made with one, two, or three supports.
When made with one projection or support, the breadth of the line produced may
be considerably varied by varying the position of the hand.
With two supports, and the point of the pencil or pen placed in a line with them,
whether between or beyond them, the line produced is nearly of equal thickness,
but capable of some modification by the position of the hand.
When made with three supports, arranged to carry the pencil or pen at right
angles to the paper or other plane surface to be operated upon, the line produced
possesses remarkable uniformity.
It can be readily applied in drawing instruments, such as bow sweeps, penta-
graphs, drawing pens, and such like.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Henry Barlow in the Great Seal Patent Office on the
20th May 1878.
WILLIAM HENRY BARLOW, of 2, Old Palace Yard, in the City of Westminster.
"IMPROVEMENTS IN DRAWING APPARATUS."
This Invention has mainly for its object to control the irregularities produced in
the breadth and steadiness of lines drawn with small brushes, termed pencils, or
other elastic pens, when held in the hand. It consists of a holder made of metal or
other suitable material, in which the pencil is firmly fixed, and from which proceed
one or more projections or supports which touch the paper or surface to be drawn
upon so as to prevent the pencil or pen from being pressed beyond certain limits.
The instrument may be made with one, two, or three supports, and the arm which
carries the brush may be jointed so as to facilitate the adjustment of the strength
of the line.
When made with one projection or support the breadth of the line produced may
be considerably varied by varying the position of the hand.
With two supports, and the point of the pencil or pen placed in a line with them,
whether between or beyond them, the line produced is nearly of equal thickness,
but capable of some modification by the position of the hand.
When made with three supports, arranged to carry the pencil or pen at right
angles to the paper or other plane surface to be operated upon, the line produced
possesses remarkable uniformity.
It can be readily applied in drawing instruments, such as bow sweeps, pento-
graphs, drawing pens, and such like.
Various forms in which the apparatus may be made are shewn at Figures 1, 2, 3,
and 4, of the Drawings annexed.
In the construction shewn at Figures 1, the holder for the stem of the brush, and
the socket for receiving the stick or handle C, are in one piece of metal.
In the construction shewn at Figures 2, the arm D (which connects the holder A
for the stem of the brush with the socket which receives the stick or handle C) is
jointed to facilitate the adjustment of the strength of line.
In the construction shewn at Figures 3, the holder A for the stem of the brush,
and the socket for receiving the stick or handle C are made from one piece of thin
sheet metal, stamped and bent to form the two parts forming the arm D, being
rivetted or otherwise secured together.
In the construction shown at Figures 4, the arm D, which connects the holder A
with the socket which receives the stick or handle C is jointed, and this socket is
formed with but one support B projecting from it in place of with two supports,
as in the constructions shewn at Figures 1, 2, and 3.
Having thus described the nature of my Invention, and the manner of performing
the same, I would have it understood that I do not confine myself to the precise
forms or constructions shewn in the Drawings, but that I claim the improvements
in drawing apparatus, substantially as herein-before described.
In witness whereof, I, the said William Henry Barlow, have hereunto set
my hand and seal, this Seventeenth day of May, in the year of our Lord One
thousand eight hundred and seventy-eight.
W. H. BARLOW. (LS)