Editing Ruler (section)

==Curved and flexible rulers==
The equivalent of a ruler for drawing or reproducing a smooth curve, where it takes the form of a rigid template, is known as a [[French curve]]. A flexible device that can be bent to the desired shape is known as a [[flat spline]], or (in its more modern incarnation) a ''flexible curve''. Historically, a flexible [[lead]] rule used by [[masonry|masons]] that could be bent to the curves of a [[Molding (decorative)|molding]] was known as a [[lesbian rule]].<ref name=oed>{{OED|lesbian rule}} {{subscription required}}</ref>