FIXED TRACER ARM POLAR PLANIMETER NO 4212 BY KEUFFEL & ESSER
Add-902. Germany, 2nd quarter 20th century, signed "KEUFFEL & ESSER CO., GERMANY" and described in the 1921 Keuffel & Esser Co. catalog as follows: "Polar planimeter, fixed tracer arm, improved needle pole, with horizontal recording wheel engaging with the measuring wheel and registering its revolutions; with table of settings." The nickel silver planimeter is in very good overall condition, in its original plush lined case.
