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Weems & Plath Marine Navigation Bi Rola Rule 13.875 Inch

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• Weems & Plath The Original Bi-Rola.
• 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", Thickness 1".

  This Weems & Plath The Original Bi-Rola features:

• Patented four-way rolling motion.
• Weems & Plath roller body has protractor markings and a nautical mile scale.
• Radial arm has Loran interpolator scales and 200 millimeter rule.
• This Weems & Plath bi-rola has automatic compass corrections.
• When radial arm and body are used jointly, the Weems & Plath birola rule becomes a 440 mm (17") divider (approximately).
• A speed/time/distance table is included.
• Weems & Plath Bi-Rola has easy to follow instructions.
• Packaged in a protective, durable vinyl pouch.
  
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