The 1944 Bletchley Park Cryptographic Dictionary
Codes and Ciphers
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2. (especially). A series (usually 3, 4 or 5) of letters or figures or letters and figures used for a unit of plain language in a particular code; a code-group.
5. One of the series of letters, or figures, or letters and figures (usually 5 in number) separated by pauses in which a code or cipher message is normally transmitted or set out.
A number of wireless stations associated or working together.
Some models have one clip, some two, on each bar, capable of being set opposite any of the wheels or in a neutral (non-operative) position. When the two clips on any one bar are both placed opposite wheels they are said to overlap and the total number of activated bars (when both such wheels have active pegs in contact with their respective levers) is one less than the total kicks of the wheels concerned for each such overlap. The wheel at the left side of the machine, by which the letter to be enciphered (or deciphered) is set, is normally lettered in the opposite direction to the printing-wheel alongside it, and capable of being set in any of 26 different positions relative to the latter, giving 26 different slides and 26 corresponding, self- reciprocal, substitutions.
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