>... a knife-edge
>device to check the figure of the mirror... I think this device was
>called a Falcault tester (or something like that).

Foucault (same guy as the pendulum :-) I just build one recently:
http://www.seds.org/billa/tester/foucault.html

Bill Arnett
http://www.seds.org/billa/
"I know that I am mortal and the creature of a day; but when I search
out the massed wheeling circles of the stars, my feet no longer touch
the earth, but, side by side with Zeus himself, I take my fill of
ambrosia, the food of the gods." -- Claudius Ptolemaeus (Ptolemy)

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