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Step 1
Wrap the line around a vertical rope going toward the desired direction of travel. The line should not be more than half the diameter of the rope to which you are tying it. The French Prusik is typically used for climbing, so normally you go up the rope.
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Step 2
Make the desired number of turns. More turns will make the knot stronger but also more difficult to use. The minimum number is 3 turns but 10 or more could be made for critical applications.
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Step 3
Tie the ends together in a secure knot, typically a double or triple fisherman's knot when used for climbing. Dress the French Prusik knot by winding the line tightly around the rope to remove the slack and ensure that none of the turns overlap.
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Step 4
Bring the loop made in Step 3 down and away from the direction of travel and place a load on the knot. Typically a carbiner would be placed on the loop from which a weight would be suspended.
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Step 5
Release the weight to produce slack and push the French Prusik knot up the rope before reapplying the weight. Repeat as needed to travel up the rope.
