1 A diaper design was then card-wired on to the shell using a template and a straight-edge.

2 A number of ancient problems concerning Compass and straightedge constructions were finally solved using Galois theory.

3 With straightedge and compasses, divide a segment of a into 2 parts.

4 Trisecting an arbitrary angle with a compass and straightedge was one of the famous ancient Greeks unsolved construction problems.

5 Long standing questions about compass and straightedge construction were finally settled by Galois theory.

6 A straightedge provides a standard of straightness by comparison with which the straightness and flatness of a surface can be inspected .

7 Small quick clamps are good for light assembly and for holding a jig or straightedge in place.