Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.
External links
[http://boatsafe.com/navigation/rules1.htm How to use parallel rulers]
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parallel rulers — a pair of straightedges connected by two pivoted crosspieces of equal length so as to be parallel at all times, used for various navigational purposes, esp. for transferring the bearing of a plotted course to a compass rose. [1695 1705] * * *… … Useful english dictionary
parallel rulers — a pair of straightedges connected by two pivoted crosspieces of equal length so as to be parallel at all times, used for various navigational purposes, esp. for transferring the bearing of a plotted course to a compass rose. [1695 1705] * * * … Universalium
parallel ruler — noun see parallel rule * * * ˌparallel ˈruler 7 [parallel ruler] noun a device for drawing lines that are always the same distance apart, consisting of two connected rulers … Useful english dictionary
parallel ruler — noun an instrument for drawing parallel lines, consisting of two or more rulers connected by jointed crosspieces so as to be always parallel … English new terms dictionary
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