## The Special Fish Report## Albert W. Small (December 1944)## Page 81 |
Tony Sale's Codes and Ciphers |

| previous page | next page | index page |

- CX/MSS

- TOP SECRET Special Fish Report Page 81

character in Delta X5 shown on the flag sheet, tried it as a dot (so there

would be 12 crosses) and tried to integrate to a X5 wheel. This failed.

(See flag sheet, Page 85.) So they tried the doubted character as a cross,

as the score actually indicated it to be, and reversed the delta X5

pattern to get 12 crosses. This integrated.

- The delta X5 pattern was then pushed through each rectangle.

as yet (Pages 86-89.) This gave embryonic Delta-X wheels on all impulses.

These embryonic wheels were then scribbled down on the wheels sheet shown, in

true versed form. See wheels sheet, Page 90. In doing this they doubted

any character which shoved less than 3 pips, and did not record it. Since

lOLog10 of (1 + Beta)/(1 - Beta) equals 3 decibans if b = 2/3, the average

rectangle pip is worth three decibans, and they therefore were doubting

any character of less than 9 decibans.

- The embryonic wheels of the wheel sheet were then held up to

wan de-delta-chied. (The known X2oneback limitation would give a good X2 by other

means, so it was not used) Thus the resultant was deltaPSI' 1,3,4,5.

- The second impulse of delta psi prime was then "counted out."

and if they were dots, to assume the motor key was a dot and therefore the

unknown delta-psi-prime impulse had to be a dot. (See the count sheets and

also the Turingery sheet.) Scoring was done as follows:

- If other deltaPSI' impulses gave: Then the deltaPSI' impulse in question was

- scored:

3 dots 0 crosses 12 db. in favor of a dot

2 dots 0 crosses 7 db. in favor of a dot.

1 dot 0 crosses 3 db. in favor of a dot.

| previous page | next page | index page |