Top positive review
52 people found this helpful
Simply the best
on 17 June 2010
I am a volunteer at Bletchley Park and as such give talks and tours on Colossus, Heath Robinson, Tunny etc. This book is simply the best that I have ever read on the subject. It has allowed me to fill in all sorts of blanks and uncertainties.
It has so many reports from peoplem who actually worked at Bletchley Park, that is is undoubtedly a "bible" for those who need it. There are many worked examples on decrypting Tunny, describing the chi, psi and motor wheels.
By the way, if you visit Bletchley Park, also take a look at the National Museum of Computing too.