The Newmanry History
Part of the General Report on Tunny (1945)
Codes and Ciphers
54H Page 374
(b) All 28 items are completely independent.
Three different tape-making jobs may be done simultaneously, each being
started and stopped by its own control without interfering with the running of
the others. The allocation of items to each job is quite arbitrary.
At the other extreme one control may control everything, producing identical
tapes from all three reperforators.
The linking of items is by plug cords.
(c) Principle of plugging.
Plugging depends on a very simple principle
( IN jacks
Each item has a series of corresponding (
( OUT jacks
Any impulse plugged into an IN jack appears suitably modified in the
corresponding OUT jack.
NOTES. Reperforators have, naturally, no OUT jacks.
Even transmitters have IN jacks.
In a common jack, IN and OUT jacks are the same.
In a control. OUT jacks are common to all 5 impulses.
Corresponding IN and OUT jacks are in the same column.
(d) The effects of the various items on an impulse taken through them.
(i) Any one of the 5 impulses of a transmitter : adds that impulse.
(ii) Common jack : the impulse can be taken out on several cords.
(iii) Delta ; from Ioneback : the same impulse one back.
from Delta-oneback : the same impulse Delta'd backwards
( Delta'd ).
(iv) "Add" : two inputs can be added (may be useful for adding two
impulses already complex).
(v) Controls : the impulses plugged into a control can be taken out into
reperforators (only one cord for each reperforator) ; each impulse is punched
in the corresponding impulse of the tape.
IN and OUT can be continued without restriction as long as there are jacks
(e) Examples :