381mm (15 Inch)
Of all the traditional parallel rulers, the 15-inch (381mm) Brushed Aluminum Arm Parallel Rule is a best-seller. This sturdy acrylic parallel rule includes a protractor scale, is easy to use, and is a necessary tool for every seagoing navigator. 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.
- 15-inches (381mm) long
- Brushed aluminum arms
- Polished aluminum handle
- Milled acrylic with beveled edges
- Includes protractor scale
- Protective plastic sleeve
- Lifetime warranty
- Weems and Plath
457mm (18 Inch)
The 18-inch (457mm) Aluminum Arms Parallel Rules feature aluminum arms that join two clear acrylic rulers enscribed with a protractor scale. An essential item in any proper navigation 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 (457mm) long
- Protractor scale
- Sturdy clear acrylic with aluminum arms
- Protective plastic sleeve
- Lifetime warranty
- Weems and Plath
600mm (23.5 Inch)
The Blundell and Harding 24-inch Parallel Rule is primarily for commercial use due to its length. Made of durable acrylic with rigid chrome arms and handles, this extra long parallel rule is perfect for plotting direction on large nautical charts.
- 23.5-inches (600mm) long
- Clear acrylic with rigid chrome arms & handles