Weems & Plath
Nautical Slide Rule
A nautical slide rule so simple you'll never get confused. Weems & Plath offers a foolproof immediate solution to all common speed/time/distance problems, convertible to statute or nautical miles. This slide rule even allows you to compute distance in yards if the speed is factored in knots.
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EXCLUDES HAZARDOUS & OVERSIZE ITEMS
CONTIGUOUS 48 STATES ONLY