Amprovement in Drawing rens.
Year: 1898

page_text: I, EMILE HERVAIS, of 9, Rue Saint Sébastien, Paris, in the Republic of France,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to drawing pens, and has for its object to increase the
usefulness of such instruments. The improvement consists in forming the work-
ing edges of drawing pens in such a manner as to enable the pen to be used for
drawing lines of any thickness, from the very finest to the thickest without alter-
ing the adjusting screw, but by merely altering the inclination of the drawing
pen relatively to the paper by a movement of its handle.
To this end, according to my improvement the blades instead of terminating
as usual in a blunt point, have formed at their extremities a flattened portion of
rather greater width than is usual and in the form of a spatula ter-
minating in a curved edge. Owing to the said curvature of the edges
the two blades form an angle between them, so that when the blades are
approached together until they touch each other at one point, the curved edges,
on account of their inclination, diverge gradually one from the other from such
point. The result of this is that according as the drawing pen is placed on the
paper so as to touch the same at one or another point in the length of its curved
edges the instrument will draw a line which is more or less fine; and it is
sufficient, in order to vary the thickness of the line, to merely alter the inclina-
tion of the drawing-pen relatively to the paper.
Obviously the improvement is equally applicable to the pens of drawing com-
passes as well as to ordinary drawing-pens having a handle.
Dated this Twenty-third day of December 1898
Amprovement in Drawing rens.
I, EMILE HERVAIS, of 9, Rue Saint Sebastien, Paris, in the Republic of France,
Engineer, 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 drawing-pens, and has for its object to increase the
usefulness of such instruments. The improvement consists in forming the work-
ing edges of drawing-pens in such a manner as to enable the pen to be used for
Price T

page_text: drawing lines of any thickness, from the very finest to the thickest, without alter-
ing the adjusting screw, but by merely altering the inclination of the drawing
pen relatively to the paper by a movement of its handle.
The invention is illustrated clearly in the accompanying drawings which are
on an enlarged scale and in which Fig. 1 is an edgewise view of two blades of
my improved drawing pen. Fig. 2 is a side view of Fig. 1 looking in the
direction of the arrows 22. Fig. 3 is a plan of Fig. 2.
As will be seen from the drawing the pen blades B B instead of terminating
as usual in a blunt point have formed at their extremities a flattened portion of
rather greater width than is usual and in the form of a spatula terminating in a
curved edge G. Owing to the said curvature of the edges the two blades BB
form an angle between them, so that when the blades are moved together until
they touch each other at one point, the curved edges G G, on account of their
inclination, diverge gradually one from the other from such point (see Fig. 3).
The result of this is that according as the drawing-pen is placed on the paper su
as to touch the same at one or another point in the length of its curved edges,
the instrument will draw a line which is more or less fine; and it is sufficient,
in order to vary the thickness of the line, to merely alter the inclination of the
drawing-pen relatively to the paper.
Obviously the improvement is equally applicable to the pens of drawing com-
passes as well as to ordinary drawing-pens having a handle.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
The improvement in drawing pens which consists in forming the working points
or edges substantially as and for the purposes herein set forth and illustrated.
Dated this 21st day of September 1899.
For the Applicant,
J. C. CHAPMAN,
Chartered Patent Agent, 70, Chancery Lane, London, W.C.