So let's get this straight:
There are 20 twips to a point, 6 points to a poppyseed, 4 poppyseeds to a barleycorn, 3 barleycorns to an inch, 3 inches to a palm, 3 palms to a span, 2 spans to a cubit, 2 cubits to a yard, 2 yards to a fathom, 11 fathoms to a chain, 10 chains to a furlong, 8...