[ATM] Re: Emailing: Large Measuring Engine

["David Harbour" <scarab2@cox.net>]

Thanks, Art.

Tell him that Roger Tuthill used to do something even more dangerous:
suspend large mirrors upside down over a pool of oil or Mercury, with a film
of vegetable oil on the Mercury to dampen ripples, so he could test Cass.
combinations together, as in an autocollimator- I guess he just couldn't
find the scratch for a big flat, so he could do this all on the horizontal.
("On the level?").

Davey


Dave----- Original Message ----- 
From: <artbianconi@blast.net>
To: "David Harbour" <scarab2@cox.net>
Sent: Saturday, April 30, 2005 6:14 PM
Subject: Re: Emailing: Large Measuring Engine


> I don't have time to go into the details of the idea but it appears
> similar to a concept I discussed with Gordon Waite of Waite Research.
>
>
> Gordon makes large mirrors, 26" and up and seeing him struggle to
> lift one of those monsters is awful.
>
> "Gordon, why not leave the mirror on the polishing bench and build a
> Foucault tester up near the ceiling looking straight down? You could
> scrub down the mirror in place, turn on the tester and focus it
> remotely, while looking at the TV image like you do now."
>
> Gordon is meticulous and the idea of having anything above the mirror
> dripping dust and such is verboten.
>
> I like the idea if for no other reason that the distortion of thin
> glass that occurs when it's turned upright are no longer a factor.
>
> Gotto get back to work
>
> Thanks and please keep me posted
>
> Art
>
>
> This post and any attachments were tested before being sent and found
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>
>
>


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