The US 6812 Division Bombe Report Eastcote 1944 Page 64

Tony Sale's Codes and Ciphers

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- 52 - TOP SECRET-T

number assigned by B.P. Under Menu No. is written the menu number
assigned by B.P. The Wheel Order is the wheel order of the stop
called in by the checker. In the Stop column is entered the relative
ringstellung and the stecker of the input letter. Under Value is
written the number of self steckers, legal contradictions and
confirmations found when this stop was checked. The Stop Number is
the number of the stop in the run being made by the particular bombe.
The remaining columns are self explanatory.

After the particulars of the stop have been entered in the

Teleprinter Log book the information is sent to Hut 6 via the
teleprinter. The following shows the make-up of such a message:


6/51 PHILADELPHIA SPARROW 1 1/11 381m 1 512 HWXZ 2CON 1SS 37
2255/1/ RJF +
R/MEM+


By reference to the Teleprinter Log the various parts of the above
message can be easily identified.
->@@

When each bombe has finished its runs on a given menu the IC

OPS notifies two different sections of B.P. First a telephone call is
made to the Master Checker-Controller Desk in Hut 6 (telephone number
B.P.7) and they are notified that Philadelphia has just completed its
run on Sparrow, job 381 Monkey. At some later time a search is made
of the Teleprinter log and the Operator's Job Sheet to find how many
stops have been sent in to Hut 6. This is summarized in a teleprinter
message to Hut 6 stop testing room via Hut 23 in the following form:


6/59 PHILADELPHIA SPARROW 1 1/11 381M 1 SN 6,11,19,37


The message is identical in explanation with the message above
sending in the stop except for SN 6,11,19,37 which is a summary of
the numbers Of the stops shown on the Operator's Log which were
previously sent in to Hut 6.

STOP CHECKS AS WRONG.

If the stop checks as wrong the checker must indicate

what is wrong at the bottom of the stecker column and on the stop
slip before returning the stop slip to the operator. One or more of
the following faults night result from checking:

In addition to indicating all faults found, the checker must go both
ways around a closure that fails and put down both sets of steckers
in the stecker column opposite the menu letters on the closure.

When the operator receives the returned stop slip with the

indication of a wrong stop, he finishes the run on a subsequent wheel
order and then replaces the wheel order involved in the wrong stop.
The run is again made to bring in the stop in question. When he
reaches the point in the run where the stop should come in but does
not, the operator stops the bombe and calls the technician. The bombe
is turned over to the technician to find the trouble causing the
wrong stop. The technician finds and clears the trouble which caused
the wrong stop. He records the trouble in the REMARKS column of the
Operator's Job sheet. If the trouble is found to be a short circuit
it is also recorded in the back of the Machine Log book as follows:

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