This instrument typically has two legs, hinged at one end and with sharp points at the other end. It can be used by itself or in combination with a calculating instrument, such as a sector. Most ...

Place the compass at point P and draw two arcs, crossing the line either side of P Image caption, Put the compass point at E and draw an arc below the line. Repeat from point F without changing ...

Image caption, ...then keeping the compass width the same, put the spike at the top of the circle, and draw another arc that crosses the first one. Join the points where the arcs cross to bisect ...