W&P 136 These navigator's parallel rulers are inscribed with full 180º protractor markings. The middle of the bottom edge forms the protractor center when the arms are closed. This tool combines the essential features of a protractor plotter and a basic parallel ruler. Allows courses to be measured from a convenient meridian. Made of extra strong, crystal clear acrylic.
A new release of an old ship's pilot favorite. This l2" Triple Arm ruler is built to the same exacting high standards as our premium Weems & Plath rulers. The unique 3 rule construction allows greater parallel walk without the diagonal creep associated with traditional designs. Milled with bevelled edges, 0. 1 9 inch thickness, with aluminum arms and handles. Wt. 7 oz.