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Paul Browne Registered Registered: October 2002 Location: Tampa, Florida Posts: 31	This sketch shows a Prytz-type planimeter as built by Weston Farmer.
	· Date: September-3-2003 · Views: 5408 · Filesize: 173.0kb ·
	Additional Info
	Rating: 9.00
	Keywords: Knife Planimeter Home-made

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gonzo

Senior Member

Registered: August 2002
Location: Milwaukee, WI
Posts: 7,215

September-15-2003 6:04pm

Rating: 9

These cheap planimeters work with amazing accuracy.

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Gonzo

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Bruce Taylor
Junior Member

Registered: October 2003
Location: Wakefield, QC, Canada
Posts: 34

November-13-2003 12:39pm

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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