Poul-Henning Kamp wrote: > In message <[email protected]>, 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. > > One unclassified application is the 1.12m diameter secondary mirrors of ESO's 4 VLT telescopes in Chile.
Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
