Page 108 - Eric C. Fry - Knots and Ropework

58 The tack knot is a real old-timer and though little used
today is nonetheless a useful decorative knot. A modern
sail still has its 'tack' even if it is no longer secured by a
Tack Knot* tack knot. It is invariably made on a rope's end and can
easi ly be mistaken for a manrope or stopper knot.
As distinct from either, it is a double wall (Knot 52), double
crowned (Knot 53). Fig 1 showing the double wall and
Fig 2 the double crown on top. The ends are then tucked
down through the knot, Fig 3, tapered as Fig 4, and
finally served, Fig 5.