Weems & Plath Marine Navigation Bi-Rola Rule (13.875-Inch)
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Weems & Plath Marine Navigation Bi-Rola Rule (13.875-Inch) Overview
This rule s patented vertical and horizontal rolling motion simplifies course and plotting calculations, while the unique radial arm allows you to automatically include compass corrections in your course plotting. Dims: Length 13-7/8, Width 2-5/8, Thickne
Weems & Plath Marine Navigation Bi-Rola Rule (13.875-Inch) Feature
- Patented four-way rolling motion
- Roller body has protractor markings and a nautical mile scale
- Radial arm has Loran interpolator scales and 200 millimeter rule
- Automatic compass corrections
- When radial arm and body are used jointly, the birola rule becomes a 440 mm (17") divider (approxima
