18" Aluminum Arms Parallel Rule (Weems & Plath 138)

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The 18-inch (45.72cm) Aluminum Arms Parallel Rules feature aluminum arms that join two clear acrylic rulers enscribed with a protractor scale. An essential item in any proper navig ation kit, these rules are used to plot direction on a nautical chart from any convenient meridian or compass rose. The two straight-edged rulers are connected to maintain the same angle. By walking the rules across the chart and securely holding down the non-moving ruler, you can effectively plot a course 18-inches (45.72cm) long Protractor scale Sturdy clear acrylic with aluminum arms Protective plastic sleeve Lifetime warranty Length: 18 in (45.72 cm) Width: 2.6 in (6.6 cm) Height: 0.5 in (1.27 cm) Weight: 0.5 lb (1.27 cm) UPC Code: 721002001382 HTS Code: 9017.80.0000 NSN: 6675-01-573-2795 Show more