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Vintage_Gelman Instrument Polar Planimeter - Made in Germany - - $20 (Dundalk)
condition:
like new
make / manufacturer:
Gelman
model name / number:
62924
size / dimensions:
9 x 3.5 x 2
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A great gift for the mathematician, surveyor, calculus teacher, scientist nerd in your life...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 They were once common, but have now largely been replaced by digital tools.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.