Page 104 - Gibson W.B. "The complete guide to knots"

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fig. 1

turn the right toward the left, so that
the right comes knuckles down (fig.
1). This automatically forms an
underhand loop, which the right hand
hangs over the extended left fingers
(fig. 2). Move the right hand along
the rope to the right and repeat the
maneuver with the second loop. Then
go farther to the right and form a
third loop the same way

fig. 2