Tales of Things
Where everything has its memory
OTT POLAR-PLANIMETER
A mechanical device to compute a closed area by following its contour.
Tales
OTT Polar-Planimeter
This is a precision mechanical integrator made by OTT in Kempten, Germany, in ~1950. It is used to compute the magnitude of a closed area by following its border with a stylus; two wheels rotate during this movement and their index can be used to compute the area. The picture shows the device computing the work done by a thermal engine using its (pressure, volume) diagram.
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OTT POLAR-PLANIMETER
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