zigzag rule

zigzag rule

[′zig‚zag ‚rül]
(engineering)
A folding ruler having pivoted sections that lock when the ruler is opened.

zigzag rule

A folding rule whose sections are pivoted; stiff when fully opened.
References in periodicals archive ?
Available in 2-, 3-, 4-, 5-, 6- and 8-foot working lengths, the zigzag rule made it much easier to measure length.
Today he concentrates on four categories: folding boxwood rules, zigzag rules produced from 1900-35, tape measures and miscellaneous measurement tools (cigar measures, for instance).