Professional grade rolling navigation ruler. In excellent condition with original case and instructions. Shipping considered but not included in price.
Information from the manufacturer Weems & Plath:
The Bi-rola Rule is a rugged plotter used by professional navigators. The patented vertical and horizontal rolling motion simplifies course and plotting calculations.
* Adjustable radial arm allows automatic compass corrections in course plotting
* Roller body with protractor markings & nautical mile scale
* Brass rollers
* Radial arm has Loran interpolator scales & 200 millimeter rule
* When radial arm & body are used jointly, the Bi-Rola becomes a 17-inch divider
* Speed/ time/ distance table included
* Easy to follow instructions on back of protective, durable vinyl pouch
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