 12" Brushed Aluminum Arm Ruler 140
with Graduations
12 inch length, 0.22 inch thickness, aluminum arms and handles. Wt. 5.5 oz.
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 15" Brass Arm Parallel Ruler142
0.14 inch thickness, solid brass arms and handles. Wt. 7 oz.
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 24" Commercial Parallel Rules24
with protractor scale. Used to plot a course from a convenient meridian or compass rose on a chart.
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 Triple Parallel Rulers136
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.
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 Bi-Rola Rule Rolling Plotter155
Weems & Plath has patented the Bi-Rola for its vertical and horizontal rolling motion to simplify course plotting calculations, while the unique radial arm allows you to automatically include compass corrections in your plotting. The Bi-Rola is the most completely self-contained device in its class, and will withstand years of use due to its brass and heavy duty plastic construction.
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 Bi-Rola Rolling Ruler P.R.220
Made with the professional in mind, the P.R. 500 has a considerably larger body than the smaller Bi-Rola rule. Built to take the rigorous use aboard commercial and blue water vessels, the P.R. 500 provides one of the easiest methods invented, to date, of plotting courses. Dimensions: Length 19-5/8", Width 3-5/8", Thickness 1 1/4". Weight: 1 lb. 10 oz. Features: Patented four-way rolling motion, Roller body has protractor markings every 1/2 degree, 1-1/4" magnifying lens for enhancing chart data, Easy to follow instructions. Comes packaged in a protective, durable vinyl pouch.
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 Parallel Plotter120
The instrument consists of a plotter mounted on a roller. The plotter contains distance scales at 1:20,000,1:40,000 and 1:80,000 to fit the N.O.S. Coast and Harbor Charts and also an inch scale. A semi-circular protractor is included for measuring courses and bearings against a meridian on the chart, and two quarter circle protractors for measuring courses and bearings against a parallel of latitude. Courses and parallel lines are transferred and kept parallel by means of two rollers which are mounted on a slide axis. Used for measuring or laying off courses and distances on a nautical chart. Instructions included. Wt. 5 oz.
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