Description

Rolling Rules by the Dozen, German, c. mid-20th c., the 12-1/2″ x 11-3/4″ (32 x 30 cm) fabric-covered fitted wood case containing a salesman’s full diversity of 14 opisometers. Most have plated brass handles and mounts, and colored paper dials (recording Inches to Miles or Centimeters to Kilometers, or Nautical Miles, or Russian Verstes, etc.), and are two-sided. Each has a small rolling wheel geared to the hand(s), in order to measure, and convert, distances on a chart or graph. Some are combined with magnetic compasses, two have plastic cases (signed “Atlas”), two have calibrated wheels driving multiple hands, etc. Condition throughout is as new. A rare opportunity to acquire this complete collection / physical documentation.