sale a “Weems & Plath 12-inch Brushed Aluminum Arms Parallel Rule” #137
– This sturdy acrylic parallel ruler with brushed aluminum arms,
polished aluminum handle, and is milled with
beveled
edges
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.
– The item is previously owned but in very good condition
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