Sheet Bend

The sheet bend is the most important knot for joining two rope ends,
especially if the ropes are of different sizes. Sailors named it in the days
of sailing ships when they would "bend" (tie) the "sheets"(ropes attached
to the clew of the sail).

Begin with a bight in the larger rope. Then weave the end of the smaller
rope through the eye, around the bight, and back under itself. Snug it
carefully before applying any strain to the knot.

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Forty Boy Scout Knots