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.

Measurement: weights & measures an essential part of farm operation

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).

"I'm looking for what I don't know exists"

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