Weems & Plath 12" Brushed Aluminum Arms Parallel Rule

This sturdy 12-inch (30.48cm) parallel ruler with brushed aluminum arms is inscribed with a protractor scale. It is 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. #140 12-inches (30.48cm) long Includes protractor scale Brushed aluminum arms Polished aluminum handle Milled acrylic with beveled edges Protective plastic sleeve