Sell Weems & Plath Navigation Parallel Ruler

sell Weems & Plath Navigation Parallel ruler  ,Nautical Triangles with Handle
 IMPA 371001  371002 371007Weems & Plath
A parallel ruler is used to determine the direction of a course plotted on a chart.  The ruler is walked from the course line to the nearest compass rose.  The course heading can then be determined.
15" Brass Arms
Solid brass arms and handles.
1/8" (4 mm) thickness; 15" (381 mm) length.
Wt: 7 oz. (199 g).

Protractor Triangle with Handle
Inscribed with contrast-enhancing colors.
Using two 45° triangles provides easy method of plotting and performing chart work.
Protractor scales allow easy alignment with chart meridian, in any direction.
Direction is maintained as one triangle is slid along the other to desired position.
Durable, clear vinylite.
Short sides (170 mm).
.08" thick (2 mm).