The Medway Handyman wrote:

The latter would never penetrate my alluminiun foil hat though....

At half term we went to a show at the Peter Harrison Planetarium at
the Royal Observatory, Greenwich. It's covered in an 8mm phosphor bronze
shell.

At the start of the show they asked us to turn off our mobile phones but
commented that anyone who could get a signal must have quite a phone!

http://www.nmm.ac.uk/places/royal-ob...y/planetarium/

Guy
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Guy Dawson I.T. Manager Crossflight Ltd