Tully Machine Restoration - The National Museum of Computing Videos for
Engineers
In
the news recently was restoration to operational condition a Tunny code-breaking machine from the World War II
era. It is part of the collection of calculating machines on display at the UK's
National Museum of Computing, located in the renowned
Blechley Park complex. Tunnys were used to decipher
messages generated on the Lorenz SZ42
enciphering machines and sent from Hitler to his generals. Work was at a fever pitch in the days running up to the
D-Day invasion. Keep in mind that the computers did not
crack the code, they were for rapid deciphering of the volumes of messages sent daily. Restoration work on Tunny
was performed by a team led by computer conservationists John Pether and John Whetter. "As far as I know there
were no original circuit diagrams left. All we had was a few circuit elements drawn up from memory by engineers
who worked on the original," per Mr. Pether. One of the original electrical designers, Sid Broadhurst, reportedly
left an envelope filled with his engineering sketches sitting in the building's bathroom during the time when many
of the machines were being dismantled. British Telecom (BT) engineers helps by providing expertise and a source of
spare parts. I could not find a reference as to how many valves (tubes, to us Yanks), relays, switches, and feet
of wire were used, but according to one source, a requirement for the project was that parts count be kept to a
minimum in order to assure that it would be operational before the war was over - in favor of the Germans! Here is
a really good write-up on the
Colossus project that talks about
Tully machines that includes detail on how the codes were cracked.
Tunny Deciphering Computer
The National Museum of Computing
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