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England, c. 1850. Boxwood ruler for determining scale on maps. This 6" x 2" surface is heavily i...

Currency:USD Category:Everything Else / Other Start Price:NA Estimated At:150.00 - 200.00 USD
England, c. 1850. Boxwood ruler for determining scale on maps. This 6  x 2  surface is heavily i...
England, c. 1850. Boxwood ruler for determining scale on maps. This 6" x 2" surface is heavily inscribed with three different scales of miles. Some inscription is rather cryptic such as 1 kilometre = 1000 metres = 1094 yards = 0.62 miles (= 5/8 mile nearly)    $150