A bar with one accurately straight edge, used for testing whether something else is straight.
- I clamp a steel straight edge in a vise and just draw the surface over the steel edge a few times.
- They checked to see if the slab would easily wrap around the pipe and then used a straight edge to cut out an appropriate-sized rectangle from the clay.
- Measuring instruments, like levels and straight edges, are in that anomalous class of hand tools which do not directly affect the work piece, but only report on its status.
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