Re: ATM 1st vs 2nd edition Texereau & 3rd edition Berry

["Bill T." <twentiethwave@hotmail.com>]

In one of the Berry's "Build Your Own Telescope" editions, there is a
discrepancy between the Foucault tolerance graph and the actual Foucault
readings given as an example.  They were from two different mirrors -- it
can drive a beginner nuts if he tries to match up graph and data!  It was
corrected in a later edition.  It's enough to simply know that the
discrepancy is there...don't avoid the edition.

Bill Tondreau