The US 6812 Division Bombe Report Eastcote 1944 Page 32

Tony Sale's Codes and Ciphers

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Single Input With Subsidiary. Frequently the main menu is not strong
enough to hold the number of stops per wheel order down to a reasonable
figure. When this happens a subsidiary menu is added. The following is an
example.


The bombe is set up for this type menu in the same way as for a regular
single input menu. The probable searching key would be M. When checking
this type menu apply the stecker letter from the bombe in the normal manner
to the letters of the main chain. From these you may or may not get on to
the subsidiary chain. If you do, and work out its steckers, these must be
evaluated together with the main chain.

Double Input With Subsidiary. - The procedure for this type of menu is very
similar to that for Single Input With Subsidiary. The following menu is a
sample:





For the checking of this menu, see fig.23.


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