Summary

by John Marshall Royal Naval Biography — Ricketts… (1823)

To obviate this danger, Captain Ricketts turned his attention to the subject, and planned a code on an entirely different system, at once so simple as to be readily understood by the meanest capacity; and so safe from discovery, that even if they lay open before an inquisitive stranger, or fell into the hands of the keenest of our enemies, no danger could be incurred, because it would be impossible under such circumstances to comprehend them.
Source: Wikisource

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