Page 53 - Cliff Jacobson - Outdoor Knots
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half hitch high on the post (same way you complete a timber hitch) to keep the
post vertical when pulling.
Figure 25. Prussik Knot (right-handed only)
Use the prussik knot whenever you want an absolutely secure loop that won’t
slip along a tight line. Mountaineers use this knot for footholds to help them
climb a vertical rope. The prussik loop slides easily along a tight rope, yet it
jams solidly when a load (horizontal or vertical) is applied. I’ve found this knot
useful for rigging rainflies in camp and for rescuing rock-pinned canoes in a
river. Make the loop from a length of parachute cord, completed with a
fisherman’s knot.