The Special Fish Report
Albert W. Small (December 1944)
Page 104
Tony Sale's
Codes and Ciphers
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CX/MSS
TOP SECRET Special Fish Report Page 104
As described at the bottom of Page 77, De1ta-K2 may be written out
in a width of 31 if there is a X2oneback limitation, or else Delta-K2 plus P5twoback
may be written out in a width of 31 if there is a X2oneback + P5twoback limitation,
and the excesses of dots over crosses in the columns then indicate the pattern
of Delta-X2 + X2oneback + cross (or "chi-two-cap-inverse.") From such a pattern,
if complete and accurate, the X2 wheel can be obtained and the direction
of signs will be proper (i.e. verse instead of inverse.)
An attempt to get such a pattern is therefore often made
with key obtained from cribbing. Results are used in conjunction
with the DeltaK35 rectangle, or with Colossus wheel-breaking runs,
as a "head start" to X recovery.
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