"Gilles Tran" <tra### [at] inapgfr> wrote:

> raytracing, here's a link to an engraving describing this very, very early

> on the Art of Measurement).
> http://www.columbia.edu/cu/lweb/eresources/exhibitions/treasures/html/55.html

You put me in my place :-) [Big cheesy grin]
I saw that illustration years ago and I thought he was inventing the double
base :-)

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