# The Newmanry History

## Part of the General Report on Tunny (1945)

### Page 340

Tony Sale's
Codes and Ciphers

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53 J Page 340

+10,000, up for + 20,000.

(d) on Colossi with short bedsteads

spanning, is unable to distinguish places 10,000 apart so that e.g. 500 -
1,000 cannot be disentangled from 10,500 - 11,000.

(e) End of Span cut-out

The ES c/o switch in the bottom row of the selection panel overrides the end
of span switches and spans to the end of the tape.

53J Q PANEL (Fig 58(xiii)).

(a) Q Selection switches

At the top right of the selection panel there are three large three-way
switches. Each switch has a neutral position and the active positions are Z,
delta Z; X , delta X; PSI , delta PSI . The streams to which these switches are
thrown are added together, and their sum appears in the Q panel: the five impulses
of this sum are called Q1,Q2,Q3,Q4,Q5.

Note: each large switch is really five switches linked together viz. one switch
for each impulse : if necessary these can be separated.

(b) The Layout of the Q panel

The upper part (10 rows) is used for imposing conditions on individual
impulses.

The lower part (5 rows) is used for imposing conditions on the sums of
impulses.

(c) Conditions on individual impulses

Every row in the upper part of the panel is arranged as follows. At the left
there are five 3-way switches, one for each impulse, each of which can be thrown
to dot or cross to make the corresponding impulse of Q dot or cross. At the
right there are five switches labelled 1,2,3,4,5, one for each counter, to
determine the counters in which the condition is to be imposed.

Any number of rows may be used: if conditions from two of them are switched
into the same counter, both will be imposed.

(d) "Not" switches

To impose alternative conditions

"either A or B"

is replaced by the equivalent

"not (not A and not B)".

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