Special Features:

Plastic; o/a 13.500 in.Lg by 1.500 in.Thk; offset protractor type; protractor 2 sc 5.000 in.Dia semicirc shape, grad inner sc 360 to 180 degrees range 1 degrees sm increment, outer sc 0 to 180 degrees range 1 degrees sm increment; w/o aux protractor; plotter 6 sc top and bottom outer sc ea 1 stat mile to 0.06336 in.100 stat miles to 6.336 in.200 stat miles to stat mile sm grad increment, top and bottom inner sc ea 1 stat mile to 0.12672 in.50 stat mile to 6.336 in.100 stat mile to 12.672 in.Sc ratio 5 stat mile sm increment, in.Sc 1 to 1 in.Sc ratio 1 in.Sm increment, vert end sc 1 to 23 stat mile and 23 to 1 stat mile sc ratio 3 stat miles sm grad increment

Properties:

An item generally constructed on a transparent plastic material. It embodies a standard inch scale, an inner and/or outer statue mile scale, a vertical statue mile scale, and may also include a nautical mile scale. The semicircular protractor portion may be offset or inset in forming a part of the item. It is designed to be used in plotting courses, measuring distances between two points on a chart or map, establishing meridians of references, solving wind angles, and determining bearing positions.