An Improved Instrument for Drawing Curves.
Year: 1895

page_text: Date of Application, 14th Feb., 1895-Accepted, 6th Apr., 1895
COMPLETE SPECIFICATION.
An Improved Instrument for Drawing Curves.
WILLIAM JAMES WALSHE and JOSEPH MCCONNELL of 50 Hatfield Street,
Ormean Road Belfast, Ireland Architects and Civil Engineers 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 apparatus consists of a body or blade A, of any good hardwood about
15 inches long, 2 inches broad and of an inch thick. To one end of the blade a
well tempered ribbon of spring steel E E about 2 ft. 8 inches long 4 inch broad and
sufficiently strong not to bend behind the pen or pencil, is firmly screwed, and then
curved or bent backwards on itself till it lies along the upper edge of the blade A,
and in the same plane. At a distance along this edge of about 5 inches the ribbon
or spring passes under a strong shaped brass clamp B which is screwed to side
of blade and furnished with a milled headed binding screw. The spring is then
curved inwards towards the end of the blade. A hole is drilled in this end of the
spring or ribbon through which a sliding pivot with binding screw D passes, firmly
securing it to a brass slip C. C is an L shaped strip of brass of same breadth as
the blade and having a slit cut for nearly the whole length of its longer arm, in
which the pivot D with spring attached slides. The end of the longer arm is
screwed to edge of blade, whilst the shorter limb (2 in.) is screwed to end of blade
or wooden body ol apparatus. In order to let the inner head of pivot D move
freely a piece, corresponding to length of slit in C is cut out of the wood as shown
in drawing.
The spring can be regulated to any degree of curvature either by sliding pivot D
along the slit and then binding by screw, or by drawing ribbon through clamp B
backwards or forwards and binding with screw. Finally the spring can be slipped
from under clamp B, thus obtaining one large simple curve, which in its turn can
be regulated by pivot and screw D. The edges of wooden part of instrument to
be bound with brass.
Having now particularly described and ascertained the nature of our said inveu-
tion and in what manner the same is to be performed, we declare that what we
claim is-
That in this, an instrument for drawing curved lines, a steel spring or
ribbon is used, of which one end is fixed by screws to end of blade or frame
of instrument, whilst the other is attached to a sliding pivot, and by means
of which the curvature of spring can be regulated, and then kept in position
by clamp, and binding screws, as described above, with reference to drawings
annexed.
Dated this 13th day of February 1895.
WILLIAM JAMES WALSHE.
JOSEPH MCCONNELL.

page_text: Date of Application, 14th Feb., 1895-Accepted, 6th Apr., 1895
An Improved Instrument for Drawing Curves.
WILLIAM JAMES WALSHE and JOSEPH MCCONNELL of 50 Hatfield Street,
Ormean Road Belfast, Ireland Architects and Civil Engineers 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 apparatus consists of a body or blade A, of any good hardwood about
15 inches long, 2 inches broad and of an inch thick. To one end of the blade a
well tempered ribbon of spring steel E E about 2 ft. 8 inches long inch broad and
sufficiently strong not to bend behind the pen or pencil, is firmly screwed, and then
curved or bent backwards on itself till it lies along the upper edge of the blade A,
and in the same plane. At a distance along this edge of about 5 inches the ribbon
or spring passes under a strong L shaped brass clamp B which is screwed to side
of blade and furnished with a milled headed binding screw. The spring is then
curved inwards towards the end of the blade. A hole is drilled in this end of the
spring or ribbon through which a sliding pivot with binding screw D passes, firmly
securing it to a brass slip C. C is an L shaped strip of brass of same breadth as
the blade and having a slit cut for nearly the whole length of its longer arm,
which the pivot D with spring attached slides. The end of the longer arm is
screwed to edge of blade, whilst the shorter limb (2 in.) is screwed to end of blade
or wooden body of apparatus. In order to let the inner head of pivot D move
freely a piece, corresponding to length of slit in C is cut out of the wood as shown
in drawing.
in
The spring can be regulated to any degree of curvature either by sliding pivot D
along the slit and then binding by screw, or by drawing ribbon through clamp B
backwards or forwards and binding with screw. Finally the spring can be slipped
from under clamp B, thus obtaining one large simple curve, which in its turn can
be regulated by pivot and screw D. The edges of wooden part of instrument to
be bound with brass.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
That in this, an instrument for drawing curved lines, a steel spring or
ribbon is used, of which one end is fixed by screws to end of blade or frame
of instrument, whilst the other is attached to a sliding pivot, and by means
of which the curvature of spring can be regulated, and then kept in position
by clamp, and binding screws, as described above, with reference to drawings
annexed.
Dated this 13th day of February 1895.
WILLIAM JAMES WALSHE.
JOSEPH MCCONNELL.