The US 6812 Division Bombe Report Eastcote 1944 Page 22

Tony Sale's Codes and Ciphers

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- 17 - TOP SECRET-T



When going round a closure the couple of the letter started at is not the same when it is returned to.

I|P. H|T K|S I|N J|R

illegal contradiction machine should not stop

a fault on the M/c. Inform Technician.



To get on to a subsidiary chain a letter on the main chain must be coupled to a letter on the subsidiary chain but not returning to the main chain by a couple of ary other letter of the subsidiary chain unless it confirms,

I|N.. H|L J|T K|F --- F|K M|S

permissable..

story printed of all letters on both chains if there is no legal contra- other letters

Could be the right stop.

2 letters on the main chain... coupled to 2 different let- ters on the subsidiary chain which give a confir- mation when returning to the main chain

I|N H|F J|S K|N ------ F|H|H M|K|K

confirmation

story printed of all letters on both chains if there is no legal contra- diction on the other letters.

could be the right stop.

2 letters on the main.... chain coupled to 2 dif- ferent letters on the stibsidiary chain which give a contradiction through the subsidiary chain.

I|N H|F J|S K|M ----- F|J|R M|Q|K

legal contradiction

stop

correct from M/C point of view. If either main chain letter or any subsidiary chain letter concerned on an outlying link, stop is sent in.

2 letters on the main... chain coupled to one letter on the subsid- jary chain.

I|N H|L J|F K|F ----- F|J|K M|S|W

legal contradiction

stop

as above.





After getting on to the subsidiary chain, one letter on the subsidiary chain is coupled to one letter on the main cluin which does not cqnfinn.

I|N H|L J|F K|F ---- F|K M|I

illegal oontradiction (un- less there are two relays up on the main chain). Machine should not have stopped

a fault on the M/C. Inform Technician.

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