The Special Fish Report
Albert W. Small (December 1944)
Page 28
Tony Sale's
Codes and Ciphers
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CX/MSS
TOP SECRET Special Fish Report Page 28
The British put the formula (R + qX)/(R - qX) in the following
form:
X/(R*W)^1/2 qX/(R*W)^1/2 app = X/sigma
.9 .51
1.0 .72
1.1 .91
1.2 1.05
1.3 1.19
1.4 1.32
1.5 1.44
1.6 l.56
1.7 1.67
1.8 1.78
1.9 1.89
2.0 1.99
2.1 2.09
2.2 2.2
X/(R*W)^1/2 > 2.2, q = 1.
In actual practice, however, the table is not always used. The "crude decibanning"
formula:
Numeric value of pip = (R + X)/(R - X)
is often considered of sufficient accuracy; if they feel there are a few characters
of the wheel in doubt, they "knock a little off of X".
At this point I should state that the decibannage for a whole wheel
is the sum of the decibans of the pips
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