Re: [ATM] Autocollimation Oil Test

["Don Clement" <clement.focuser@verizon.net>]

> I thought I heard some folks used it because it had higher viscosity. Less
> sensitive to vibration?


 Mercury doesn't seem like the safest material unless you want to wind up
like the Mad Hatter*. Vibration effects using oil on larger optics might be
less if supported by a vibration isolation system. An inexpensive type using
inner tube and sandbox is easy to build. See:
http://www.holo.com/holo/book/book6&7.html



Don Clement

Running Springs, California



* Felt hats used mercury as part of the manufacturing process during Carroll
's time.



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