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Published online by Cambridge University Press: 23 November 2009
I am indebted to Captain Duncan M. Henderson (Journal27, 536) for causing me to seek further than I had done previously to enable me to prove that ‘F’ in old log-books stood for fathoms and not fractions.
I would quote the following authorities who all state definitely that the ‘F’ meant fathoms and that there were usually eight fathoms to a knot, at any rate in the eighteenth and early nineteenth centuries. They are: