Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Rolling Spherical
Coradi Rolling Spherical Planimeter
Blackened brass and German silver
Large area measurement with high accuracy

Notes: "Like the disc planimeters, the spherical planimeter exists to improve accuracy. But rather than have a better paper for the wheel to roll on, the paper and tracing wheel are entirely replaced by a roller and spherical surface, each with a finely ground finish that eliminates any slippage. The sphere is driven by the planimeter's wheels, and the angle of the tracing arm determines which part of the sphere that the cylindrical roller contacts. This planimeter appears to be identical to the K&E model 4262 shown in the 1913 K&E catalog."

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