French Connection III, The

Chronicle of the Early American Industries Association, Inc., The, Dec 2004 by Packham, Jim

Although the cooper would need several pairs of compasses for the several sizes of casks to be made, the French cooper's compass has one advantage over an ordinary hinged compass. It does not slip out of its correct settling when drawing the circle for the cask head. Making this compass may have been a task for apprentices to use up leftover pieces of oak.

But what technique did they use for this French connection?