How Volunteers Rebuilt WW2 Computers

nk497 writes "A single photograph, scraps of circuit diagrams drawn from memory and a pile of disused components – it isn't much to go on, but from such meager beginnings, engineers rebuilt one of the precursors to the modern computer. The Tunny decryption machine – on display at The Museum of National Computing at Bletchley Park, Buckinghamshire in the UK – was a feat of engineering both during World War II when it was created, and over the past five years when it was rebuilt by retired BT engineers."