The US 6812 Division Bombe Report Eastcote 1944 Page 19

Tony Sale's Codes and Ciphers

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- 14 - TOP SECRET-T

the pointers are set for the first link to be checked. Depress the
key corresponding to the relay letter (stecker of the input letter)
and observe the lighting a lamp corresponding to the stecker of the
letter at the other end of the link. Follow round until all links on
the menu have been checked.

Definitions Used In Checking


Closure Made (Indicate with /) Occurs when the same stecker letter is

obtained over 2 different links between 2
letters. (Female)

Confirmation (Indicate with ") occurs when stecker for one letter on

the menu is another letter on the menu an
vice versa.

Contradiction occurs when a confirmation does not occur

between 2 litters on the menu.

Legal Contradiction (Indicate with *)exists when 2 letters on the

menu are steckered to the same letter off the
menu.

Illegal contradiction (Indicate with x) exists when 1 letter on the

menu is steckered to another letter on the
menu, but not vice versa.

Good Stop (Indicate with /) any stop without illegal contradictions.
Bad Stop (Indicate with x) any stop with illegal contradictions or

fails a closure (all letters obtained art off
the menu).

Hut 6 Stop (Indicate with mc/) any stop without any contradictions or

with one legal, provided one of the letters
involved is on an outlying link or on a
phantom. For a single input menu with
auxiliary, if a double entry into the
auxiliary from the main chain is obtained,
this counts as a legal contradiction.
If the 2 letters on the subsidiary give a
confirmation when returning to the main chain
this stop is sent to Hut 6. If either one or
both of the letters on the main menu
providing the entry art on outlying links the
stop is sent to Hut 6.






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