[time-nuts] beryllium oxide
phk at phk.freebsd.dk
Fri Jan 16 15:10:53 EST 2009
In message <4970E72D.1050300 at rubidium.dyndns.org>, Magnus Danielson writes:
>I have encountered Beryllium in a field none of you mentioned, as
>material for speaker cones. Light and very rigid. Perfect for the top
>driver for horns. I recall something about high speed of sound.
It is also used for mirrors for certain, usually classified,
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