London's Newest Library Has a Copper Lined Room That Blocks Messages and Emails

by aries1980on 8/15/2021, 8:30 PMwith 1 comments

by simonblackon 8/16/2021, 3:45 AM

"Copper Lined Room" = run-of-the-mill Faraday cage.

https://en.wikipedia.org/wiki/Faraday_cage