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Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Mechanical Specialties Planimeter
Mechanical Specialties
Chrome plated brass and steel
Determining Mean Effective Pressure from indicator diagrams

Notes: "The Mechanical Specialties planimeter was very special purpose. For one thing, it never left its box. The indicator diagram would be placed in the box under the retaining clips, and the planimeter would trace around it. One end of the tracing arm rides in the groove of a rail inside the box. The reading is taken from the sharp-edged sliding wheel, which slides along a graduated bar. Complete instructions, which are quite brief, are in the lid of the box."

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