rogue's yarn

The Sailor's Word-Book

A yarn twisted the contrary way to the rest of a rope, for detecting theft or embezzlement. Being tarred if in a white rope, but white in a tarred rope, it is easily discovered. It is placed in the middle of each strand in all the cordage made for the royal navy. Lately the rogue's yarn has been superseded by a thread of worsted: a different coloured worsted being used in each dockyard, so that any defective rope may be traced to the place where it was made.

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