The Newmanry History

53C Page 334



The start sign is a hole between the 3rd and 4th impulses, which

The stop sign is a hole between the 4th and 5th impulses, 1 1/2 places

150 blanks between atop and start give Colossus time to prepare for the next

The bedstead is a system of pulleys round which the tape is driven by

Each Colossus has two bedsteads; while one is in use a tape can be put on

The maximum length of tape which a bedstead can carry is either 11,000

Although shorter tapes can be put on the pulleys, Colossus does not work

The twelve wheels constituting X, Mu, PSI, are set up in 'triggers' of

For each character of a wheel there are two small sockets: a cross is

There are several alternative triggers for each wheel. The X, PSI patterns

The Mu pattern has seven triggers a,b,c,d,e,f,g, any one of which can be

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