The US 6812 Division Bombe Report Eastcote 1944Page 23 |
Tony Sale's Codes and Ciphers |
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After gettiong on to the subsidiary chain, a contradiction occurs on the subsidiary chain |
H|L J|S K|F ------ F|K|M M|F|S |
legal contradiction |
|
correct from M/C point of view. F must be tested with M and another couple M which must not contradict on the main chain. If main chain letter or any subsidiary chain letter concerned is on outlying link, stop is sent in. |
If on getting on to subsidiary chain, stop does not go round clo- sure of subsidiary chain. |
H|H J|J K|F ----- F|K P|P M|W P|T |
permissible but not completely checked. |
only |
correct from M/C point of view if on completing checking no contra- diction is found with letters of main chain. If main chain letter con- cerned is outlying link,stop is sent in. |
After getting on to the subsidiary chain,one let- ter on the same chain is coupled to a letter on another sitsidiary chain. |
J|B H|L K|P ---- P|K|R|F F|R|S|G |
permissible |
One com- plete story for all letters. |
Could be the right stop,because F-R it must then be assumed that R/F and the couple for S found. |
After getting on to the subsidiary chain 1 letter on the same chain is coupled to a letter on another subsidiary chain, a letter on this chain is then coupled back to the first subsidiary chain. |
J|B H|L K|P ---- P|K|S F|R|G ----- R|F S|P |
legal contradiction |
|
correct from M/C point of view. Only sent in if any letter con- cerned is the end letter of any out- lying link. |
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