Measuring both medium and small areas with equal precision
Notes: "This is called a pantograph planimeter because of the parallelogram mechanism between the pole arm and tracing arm. There are two tracing points, the one at the end of the tracing arm, and the bullseye window on one of the paralleogram arms, which is used for small areas. The angle between the pole and tracing arms cannot be larger than 90 deg. because the pole arm then hits the large tracing wheel. There is no brand name or model number on the planimeter or in the box. This may be an early, less sophisticated version of the Lyth planimeter."