Which of the following consists of two laths, each of 1 yard or 1m in length loosely riveted together?

Which of the following consists of two laths, each of 1 yard or 1m in length loosely riveted together? Correct Answer Butt rod

A Butt rod is used for measuring offsets, but it is often used by building surveyor or architects. It generally consists of two laths, each of 1 yard or 1m in length loosely riveted together.

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The hoop stress in a riveted cylindrical shell of diameter (d), thickness (t) and subjected to an internal pressure (p) is (where $$\eta $$ = Efficiency of the riveted joint)