The Special Fish Report
Albert W. Small (December 1944)
Page 96
Tony Sale's
Codes and Ciphers
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CX/MSS
TOP SECRET Special Fish Report Page 96
Level 1(DeltaP2 + P5twoback) differenced at 93
Level 2(DeltaP2 + P5twoback) differenced at 124
Level 3(DeltaP2 + P5twoback) differenced at 279
Level 4(DeltaP2 + P5twoback) differenced at 341
Level 5 Control: . x . x . x . x
and a Z2 tape made similarly (NOTDeltaZ2. Since DeltaZ2 can be obtained on
Robinson from a Z2 tape it is also possible to form Delta/31.k DeltaZ2 on Robinson
from a Delta/31.k Z2 tape) The Z tape looks as follows:
Level 1 Z2 differenced at 93
Level 2 Z2 differenced at 124
Level 3 Z2 differenced at 279
Level 4 Z2 differenced at 341
Level 5 Control: . x . x . x . x
Control levels are placed in tapes to permit elimination
of portions of the tape not desired, from the count. Also, since
Robinson must have one tape in which "start" and "stop" impulses
are punched, and since "stop" must follow "start" by at least 2,000
impulses to give the relays time to operate, shorter texts can be
placed on a tape of over 2,000 positions, and the control punched
"out of phase" in the blank area, causing the blank area not to
be counted at all, rather than to be counted as slants as
would have been done otherwise. This has been described in
writeups sent by Fried.
In view of the control being so constructed it is necessary
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