# The Newmanry History

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

### Page 372

Tony Sale's
Codes and Ciphers

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56G Page 372

(e) Impulse cut-out switches.

Any impulse can he cut out completely by its impulse cut-out switch : if
all the impulses of a transmitter are cut out it does not step.

(f) Transmitter output jacks.

Any one of the 25 impulses in the transmitter output jacks can, by the
obvious plugging, be transferred to a different row of the addition field. This
means that it is :

(i) cut out from its own row

(ii) added to the impulses already in its new row.

For example, if T4 T5 are cut out, and a plug cord is taken from T3(1), the
first impulse of T3, to the second row of the addition field the first row now
carries T1(1) + T2(1) and the second row T1(2)+T2(2)+T3(2)+T3(1).

(g) Adding a cross.

A shorting plug in a jack of addition field adds a cross thereto.

(h) Permuting sums of impulses.

The outputs from the addition field can be transferred to other impulses,
cancelling what is already there e.g. if the 2nd impulse in 'Sum of Impulses' is
plugged to the 5th impulse of 'Distributor', the reperforators will have nothing
in the 2nd impulse, and whatever is in the 2nd row of the addition field in the
5th impulse.

(i) Common jacks.

These, unlike the other jacks, are not permanently connected to anything
else.

Impulses plugged into a common jack are added, not in the ordinary way, but
by the rule that the output is a cross unless all inputs are dots (Boolean

Two or more outputs can be taken.

(j) Reperforators.

Either one or both can be used.

(k) Counters.

(Cyclometers) are supposed to record the number of blanks and letters
punched : they were used very little and all but one are out of order.

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