Bletchley Park is famous for its large analytic machines – but these would have been useless without a huge amount of work done with humble pen and paper.
At Bletchley Park, a pencil and squared paper were the essential tools of the codebreaker. They were used to note indicators, rotor orders and letter chains on working sheets, carry out calculations and log results. Most codebreaking, in fact, was done by hand.
The famous codebreaking machines like the Bombe and Colossus did only part of the work: a large number of tasks had to be done manually before and after the machines were used, if ciphers were to actually be broken.
In intelligence analysis, too, pen and paper were the most important tools of the trade, for notetaking and writing translations and reports. Every neatly-formatted item of Ultra intelligence which landed on the desk of an Allied general began life as a rough draft scribbled by hand on a pro-forma chit.
In short, even at one of the most advanced intelligence centres of WWII, much of the day-to-day codebreaking still relied on pencil, paper, and human brainpower.
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Looks great! Nice job, Alex!