[time-nuts] beryllium oxide

[Poul-Henning Kamp]

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,
applications.

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