Parallel rulers

Parallel rule in plastic with aluminum arms lying on a cutting mat

Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straightedges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.

This page is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.