Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Rolling Precision Disc
Ott Rolling Disc Planimeter
Painted brass
Measuring large areas

Notes: "This is a very large rolling disc planimeter, and it even has an extension to double the length of the tracing arm. The purpose of a rolling planimeter is to measure areas that are too large for a polar planimeter. The purpose of the disc is to give the tracing wheel a surface to run on with very consistent friction, which the map/drawing/data plot may not have."

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