The Planimeter Vault

Last updated: 5 June 2016: David Green


I collect planimeters.

I am interested in how they work, and how and why they were developed.

The purpose of this web site is to share what I know with fellow collectors.

The hope is that some of you will respond in kind, correct any mistakes and fill in some of the gaps.

You can contact me at Email address


1 Introduction

2 Coffin planimeters

3 Hatchet planimeters

4 Radial planimeters

5 Polar planimeters (Amsler, Coradi, etc)

6 Polar planimeters (Willis, Lippincott, etc)