From: hermit 
To: Michael Peck 
CC: atm{at}shore.net
Reply-To: hermit 


Michael Peck wrote:
>
>
> Hmm... Is this the start of a new urban legend, or is there actual
> documentation for any of this?
>
> I don't have easy access to reference materials right now, but my
> recollection is the backup test was a refractive Offner null test, and the
> problem with the reflective null test that was used was attributed to a
> spacing error.
>
> The conic constant error was about 1%. That would be tough to detect with a
> sophisticated Foucault test setup, and really tough with a typical amateur
> rig. Which isn't to say that some sort of non-null zonal test might not
> have been useful.
>

That link I posted earlier would support you.  It also gave a reference for
some kind of material that could be ordered about the probe/investigation.

Ken

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