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Details and Image



TypeModel No.MakerCountryConstruction
Material
DateScale LengthArea of Use
Hybrid
Mechanical Specialties Planimeter
Mechanical Specialties
USA
Chrome plated steel and brass
1890's
N/A
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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