Monday, May 07, 2007

Mionnet's Scale

I always thought that Mionnet invented his scale, but it seems to be merely improvements to a scale by Charles Combe. Here is Mionnet's scale and Combe's scale (from 1782!) together.

Many of the circles are the same size. Combe uses letters, and in tables gives sizes as a letter, often with a + or -.

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