The 18" Aluminum Arms Parallel Ruler features aluminum arms that join two clear acrylic rulers. An essential item in any proper navigation kit, the Aluminum Arms Parallel Rule is used to plot direction on a nautical chart. It is comprised of two straight-edges hinged so that they maintain the same angle. By alternating the moving edge, and securely holding down the non-moving edge, you can move the aluminum parallel ruler about the chart while still maintaining the same angle.
Weems & Plath Item #: 138
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