The Newmanry History

41D Page 299


This depth was much easier to read than the earlier depths had been, for

From this depth a length of subtractor key of 3,976 letters was

The Germans may have noticed this breach of security, for the traffic almost

Besides the depths in July and August there were a number of "near-depths".

It was deduced from this that the first letter of the indicator affected

Mention should also be made of some pairs of messages having the same

With luck, we might have had at this early stage a near depth whose

For a long time no progress was made in the analysis of the subtractor key

In fact the only positive information obtained during the rest of 1941 was

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