The Newmanry History

41D Page 300

The first success in the analysis or the key was obtained towards the end of

In order to reconstruct the sequences X and PSI , the first impulse was

When PSI was examined with the object of determining its non-random

In fact there was equality in about 3/4 of the cases.

even when the result (i) was taken into account.

It was then seen that the X pattern could have been reconstructed by

The most striking property of PSI, was that it was roughly periodic; it

We may here introduce a slight change of notation. The extended key which

We have now reached the stage at which the first impulse was shown to be the

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