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To make a crown on a single wall knot, take one of the ends, 'a', and lay it over the knot: lay 'b' over 'a', and 'c' over 'b', and through the bight of 'a'. Pull the ends taut.

Single Wall and Crown

To make a crown on a single wall knot, take one of the ends, 'a', and lay it over the knot: lay 'b'…

"Single wall knot -- Unlay the end of a rope, and with the strand a form a bight. Take the next strand b round the end of a. Take the last stand c round the end of b and though the bight made by a. Haul the ends taut." -Britannica, 1910

Single Wall Knot

"Single wall knot -- Unlay the end of a rope, and with the strand a form a bight. Take the next strand…