Staedtler Noris School Compass With Centre Wheel and Extension Bar

Compass Staedtler 550 With Centre Wheel Extension Bar Universal Adaptor & Lead Box
Compasses are drawing instruments that are primarily used to perform the tasks in geometry - to draw a circle around a point and to transfer distances precisely. These versatile drawing instruments essentially consist of two legs. These are usually made of metal. The legs are connected together at the top by a hinge, allowing them to move flexibly. Compasses also have a crossbar at the upper end where the legs meet with opposite-running threads. Compasses with a spindle guide have a wheel in the centre that can be adjusted with one hand. You can turn this in different directions to spread or close the legs. This allows you to quickly and easily adjust the compass to the desired position. There is also a needle at the bottom of one leg to secure the compass to a surface. At the end of the other leg, there is a replaceable lead for drawing circles or segments on paper. There are also models with an adapter for attaching a short pencil instead of the integrated lead. If you secure one leg to a surface, you can then determine the radius of a circle by setting the distance of the second leg.
Features:

• Contains 1 School compass with extension bar, universal adapter and lead box in case with hinged lid.
• Precision compass with centre wheel and quick-setting mechanism.
• Interchangeable lead part and needle.
• Hinged lead and needle legs.
• With shouldered/ pointed needle.
• Max circle diameter approx 260 mm, with extension bar approx 395 mm.
• Length 156 mm