[time-nuts] beryllium oxide
bruce.griffiths at xtra.co.nz
Fri Jan 16 15:37:28 EST 2009
Poul-Henning Kamp wrote:
> 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,
One unclassified application is the 1.12m diameter secondary mirrors of
ESO's 4 VLT telescopes in Chile.
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