The US 6812 Division Bombe Report Eastcote 1944 Page 21

Tony Sale's Codes and Ciphers

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- 16 - TOP SECRET-T

CHECKING

||To be sent in if half |To be sent in for fur-
||of legal contradiction |ther investigation.
||is on out-lying link.


Procedure:
(1) Place on the machine the w/o of stop to be tested.
(2) Rotate drum discs until letters of the stop are oposite the dots

on the drums.

(3) Decide which is the easiest way to test around the menu, starting

with the input.

(4) Turn drums to the first setting and depress the relay(couple of

the input).

(5) Resultant light indicates the couple of the next letter on the

menu.

(6) Continne the process around the menu, rotating the drums to the

next seting and depressing the previous couple to get the couple
of the following letter on the menu.


SINGLE INPUT, SINGLE RELAY.



TYPES OF CONTRADICTION AND

CONFIRMATIONS WHEN TESTING. 2 letters on the chain coupled to a third letter off the chain.	COUPLES. I|P J|T H|L K|L	STANDARD M/C'S legal contradiction	JUMBOS. stop.	REMARKS. correct from M/C point of view, If legal contradic- tion is on out- lying link,could be correct stop.
2 letters on the chain coupled to a third letter on the chain	I|P J|T H|J K|J	illegal contradiction, M/C should not have stopped.		a fault on the M/C. Inform Technitian.
1 letter on the chain coupled to another letter on the chain which does no give a confirmation.	I|P J|T H|K K|R	illegal contradiction, M/C shou]d not have stopped.		a fault on the M/C Inform .Technician.
1 letter on the chain coupled to another letter on the chain which gives a confinnation.	I|P J|T H|K K|H	confirmation.	stop.	could be correct stop.



When going rouni a closure, the couple of the letter started at is the same when it is retunied to.

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

imperative...

stop or, story.

might be the right stop.

.


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