This curious ruler features two scales: one marked “8 inches = 1 mile” and another “6 inches = 1 mile.” It’s equipped with two sighting arms—one with a slit, the other with a slit and a vertical metal hair. If these arms were mounted on a level, it might resemble a sighting level.
Its exact purpose remains a mystery. If anyone has come across a tool like this before or knows what it was used for, I’d love to hear from you.
The old tool collector 