Amsler Polar Planimeter to Find Area of Indicator Diagram Small 253×320 Medium 507×640 Large 811×1024 Download Tiff Original 1901×2400 | (447.0 KB) Description An Amsler Polar Planimeter instrument used to measure the area of an arbitrary shape. The planimeter traces the shape of the graph with respect to the origin. The wheel at the hinge shows the measurement of the area. Keywords Amsler Polar Planimeter to Find Area of Indicator Diagram, Area Measurement, Instrument to find Area of Graph, math tools, planimeter, planimeters Galleries Miscellaneous Math Tools Source: Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)