This German silver instrument has a 6-1/2" arm with tracer point and 6-1/2" pole arm. The arm lengths are fixed. The tracer arm and pole arm are connected by a hinge and form a circle around the white ...
This German-made polar planimeter has a metal tracer arm attached to a brass arm holding a brass weight, both of which are painted black. The weight is marked: KEUFFEL & ESSER Co (/) GERMANY. A black ...
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