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Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
The Trill Planimeter
Chrome plated brass
ca. 1910
Determining Mean Effective Pressure from indicator diagrams

Notes: "The Trill Planimeter was a copy of an earlier Lippincott design, which Trill bought the rights to. In practice it works like all the other, similar planimeters that measure the lateral travel of a sharp-edged wheel. This is the critical difference between these hybrid designs and true polar planimeters. The polar planimeter measures the rotation of the wheel and ignores side to side slippage. "

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