RE: ATM "Frozen" liquid mirrors

[Murray Foster <murray@vitalimages.com>]

Thanks for setting me straight.

BTW things are moving along on the binos. I have turned the disks that I am
going to use for my mirror mounts. I have two 48 inch by 7 inch AL tubes
(irrigation pipe). I'm going to build up one of the tubes this weekend to
establish actual focus distance using a teleview 32mm eypiece.

Murray

At 1:13 PM -0500 2/21/97, Kurt Hillig wrote:
>Sand is used in part because its high internal friction makes it effective
>at damping vibrations; concrete, on the other hand, is *not* good at this!
>We had a big cast concrete optical table in the basement here, made on the
>assumption that a really massive structure would be very stable.  But when
>you tapped it, it rang like a bell, and the folks who had it built went
>through a lot of trouble trying to get it to work.  Ultimately it was
>jackhammered apart and replaced with a conventional optical table.
>
>A sandbox on inner tubes - even a couple sheets of plywood laminated
>together - would be better than concrete!
>
>                            Dr. Kurt Hillig
>   Dept. of Chemistry      I always tell the    fax (313)647-4865
> University of Michigan     absolute truth     phone (313)647-2867
>Ann Arbor, MI  48109-1055    as I see it.    X.500 khillig@umich.edu
>   Computers were invented to help people waste more time faster.


======================================================
 Murray Foster           email: murray@vitalimages.com
 Vital Images, Inc.      voice: 515-472-7726 x124
 505 N. 4th Street         fax: 515-472-1661
 Fairfield, IA 52556      http://www.vitalimages.com
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