Henry Ernest Dudeney/Modern Puzzles/180 - The Damaged Measure/Historical Note

== Historical Note on by : $180$ - The Damaged Measure == reported in $1968$ that no general rule had yet been found for the ruler problem.

However, considerable progress had been made since first proposed it.

In particular, discovered in $1956$ that eight marks are sufficient to mark a $36$-inch ruler so that all integer lengths from $1$ to $36$ can be measured, outdoing 's solution by $3$ inches.