Vintage_Gelman Instrument Polar Planimeter - Made in Germany -

Gelman Instrument Polar Planimeter - Made in Germany - A great gift for the mathematician, surveyor, calculus teacher in your life.
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a fantastic and beautiful conversation piece.
Vintage Polar Planimeter by Gelman Instrument Co.
Made in Germany, in a hard green leather case with velvet liner.
Box measures 9 x 3.
5 x 2 in.
A planimeter is a table-top instrument for measuring areas, usually the areas of irregular regions on a map or photograph.
They were once common, but have now largely been replaced by digital tools.
Set contains a ship designers polar compensating planimeter for measuring the displacement of sail areas.