A Plethora of Planimeters!

Polar planimeters

Variations on polar planimeters
Robertson and Willis planimeters
Amsler's spherical planimeter

Linear planimeters
Prytz planimeters and variations

Pre-Amsler planimeters
Maxwell's planimeter: truly ingenious!

Integrators that measure centroids and 
moments of inertia in addition to area

Planimeters that measure other things

Search for planimeters on eBay!

Lasico still makes planimeters.

Robert L. Foote
Last update: 29 November 2004