The Special Fish Report
Albert W. Small (December 1944)
Page 10
Tony Sale's
Codes and Ciphers
|
previous page
|
next page
|
index page
|
CX/MSS
TOP SECRET Special Fish Report - 10
COL. 3.
SG 908 22/10 1128 time
T 2685 a l341 £ 25.5 st 1404
1p2
k1 k2
14 12 c l417
18 14 d 1421
28 07 d 1407
27 12 e 1411
31 18 a 1416
40 08 b 1405
01 04 a 1465 ch 4.9 £ (tick)
01 19 a 1406
04 12 c 1409
14 12 e l417
In this 1p2/ run, the setting Xl = 0l and Xl = 04 gave a
sigmage of 4.9. Thus the odds against getting the setting by random are approx.
1/41 x 1/3l x 2,000,000, or 150:1. It was therefore deemed correct.
The "ch" beside the score means that Colossus was set at X1 = 01, X2 = 04,
and the score was quickly checked.
The next series of runs usually made in wheel setting, includes
runs called:
"C-1," wherein count is made of the number of
times that 4 = / 1 = 2
In the deltaD texts.
"C-2" wherein 5 =/1 = 2
"C-3," wherein 4 = 5 = / l = 2
"C-4," wherein 3 = /l=2.
The reasons for these can be seen in the table of deltaD impulse characteristics
Accordingly, the next run in the above message was a "multiple test"
on wheels X3, X4, and X5, run independently though simultaneously against
the known Delta-D1 and Delta-D2. It is shown below, marked "Cl 2 & 4."
|
previous page
|
next page
|
index page
|