bi-rola Rules - Weems & Plath

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bi-rola Rules

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Original bi-rola Rule

This rules 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".
Part #155
We only ship these to Canada and the US.

Price $79.95 US$

Shipping to Canada is $15 extra
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Features:

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 (approximately)
A speed/time/distance table is included
Easy to follow instructions
Packaged in a protective, durable vinyl pouch
Wt. 12 oz.

Prices, specifications, and images are subject to change without notice. Not responsible for typographical or illustrative errors. Manufacturer rebates, terms, conditions, and expiration dates are subject to manufacturers printed forms.
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