Planimeter
Paul Browne

Paul Browne: Planimeter

This sketch shows a Prytz-type planimeter as built by Weston Farmer.

Posted by: Paul Browne - website: http://www.geocities.com/geezerboat

Paul Browne, Sep 3, 2003
    • Rating:
      5/5,
      gonzo
      These cheap planimeters work with amazing accuracy.
    • Bruce Taylor
      I've just built one, using this pic as my model. It is surprisingly accurate (certainly good enough for my modest needs). I used scraps that were lying around the shop --walnut rods, small finishing brads, and an Xacto chisel blade. I put about twenty minutes' work into it, and spent precisely nothing.

      In my tests on known areas (circles and rectangles) error levels hovered around 1%. I ran the device over my drawings for Blackfly (a small sailboat), and results were quite consonant with those I arrived at by superimposing 1/8" grids on sectional areas, curve of areas, submerged lateral plane, and so forth.

      A great little tool!
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  • Album:
    Member Album by Paul Browne
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    Paul Browne
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    Sep 3, 2003
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