IMPROVEMENTS IN INSTRU- MENTS OR APPARATUS FOR USE IN DRAWING STRAIGHT, CURVED, SPIRAL OR RADIAL LINES, HATCHING OR SECTIONING, WHICH SAID APPARATUS MAY ALSO BE USED FOR OTHER PURPOSES."
Year: 1877

page_text: "
PROVISIONAL SPECIFICATION left by August Syré at the Office of the
Commissioners of Patents on the 18th April 1877.
AUGUST SYRE, of Vienna, in the Empire of Austria. IMPROVEMENTS IN INSTRU-
MENTS OR APPARATUS FOR USE IN DRAWING STRAIGHT, CURVED, SPIRAL OR
RADIAL LINES, HATCHING OR SECTIONING, WHICH SAID APPARATUS MAY ALSO BE
USED FOR OTHER PURPOSES."
My Invention relates to an improved apparatus or instrument whereby I am
enabled to draw straight, curved, spiral or radial lines, hatching or sectioning, at
any angle from to 90°, with a drawing pen. The instrument may also be used
when engraving upon steel or copper plates with a diamond or diamond-pointed
graver.
Figure 1 of the accompanying Drawings is a plan of the instrument for use in
ruling straight lines.
Figures 2 and 3 show side and end views of the shifting mechanism separately.
The instrument is composed of a straight edge A, a sliding frame or head B, and
the shifting mechanism C.
The straight edge rule A is provided at one end with an eye a to receive a screw
centre, upon which the rule pivots for drawing radial lines. The rule A is graduated
to any desired scale, and provided with a cross piece for reckoning the minute sub-
divisions. The straight edge A, which it will be readily understood may be replaced
by a curve for making curved lines, is hinged, or pivoted to the sliding head B at b,
which is also the centre of a protractor, graduated from 0 to 90°, attached to the
rule A. The strength of the hinge joint, and the pressure of the binding screw,
ensures the necessary firmness of the straight edge or other rule.
The head B is composed of two guides d, d, receiving between them a slide
e, the
side bars being connected, and the slide retained between them by a plate f (serving
as a pressing plate) and a small plate g. A diagonal scale h, engraved on the slide e,
and a cross piece i, also graduated, fixed on slides d, d, serve for gauging or
regulating the spacing of the lines.
The mechanism C is composed of a bracket j, fixed to slide e, an elbow lever k
pivoted therein, and a spring 7 pressing the lever upwards, and received in a recess
in bracket j. The horizontal arm of the lever has a screw m to regulate the

page_text: extent of its motion, whilst the vertical arm carries a cross pin n, which is made to
bear against one or other of the studs o, o, of guides d, d, in order to move the
latter, and thereby shift the whole instrument the distance of a line. The spring
returns lever k to its normal position.
A distinctive feature of the Invention consists in the application of india-rubber
strips to the under surface of parts d, d, and e, to allow of their alternately adhering
to the surface upon which they are placed.
When the apparatus is to be used upon stone, zinc, or other hard substance a
diamond point would be fixed to the rule by means of an upright.
Figure 4 shows a simplified form of the instrument, in which the rule A instead 1
of being pivoted, as in Figure 1, is fixed to the slide e, but this arrangement is only
of use for drawing parallel lines.