The 1944 Bletchley Park Cryptographic DictionaryPage 85 |
Tony Sale's Codes and Ciphers |
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- 85 -
SYSTEM INDICATOR :
SYSTEMATIC :
TABLE :
TACK ON :
TAIL :
TAILING :
TELEPRINTER ALPHABET :
2. The thirty-two five- (or seven-)unit signals corresponding to the above, which can be regarded as consisting each of a (positive) start impulse, a negative (stop) impulse, and five impulses between these, each of which is either positive or negative. A negative impulse is conventionally represented by a cross (x) and a positive by a dot (.) and the start and stop impulses ignored, so that each character has five impulses each of which can be either a dot or a cross. Impulses are combined by addition, non-carrying, in the scale of 2 (or subtraction, which in this scale gives the same result), a cross being treated as 1 and a dot as 0.
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