Extract from The Mike Kenner Archive
This source preferred by Neal White
Authors: White, N.
Start date: September 2008
A vitrine was used to display a once classified map of the Corsham Computer Centre, a subterranean facility of the UK Military. The vitrine was concealed using vinyl. The map was visible by looking through one of a series of names cut from the vinyl. These were the secret code names given to the Computer Centre