The fisherman's knot is used by fishermen to tie silkworm gut together.
It is easily untied by pulling the two short ends, but it never slips.
Lay the two ropes side by side (_L_, Fig. 67), then make a loop around
one rope with the other rope, passing the end under both ropes (_M_).
Bring the end over and into the loop to make a single tie (_N_). Tie the
end of the second rope around the first rope in the same manner (_N_)
and draw both knots tight (_O_).