Page 61 - Peter Randall "The Craft of the Knot.."
P. 61

Also  called  the  Alpine  Butterfly,  this  loop  is  strong,  secure,  and  easily
               untied after being put under strain. It’s a great loop for use anywhere
               along a rope, and holds well even with strain put on both standing parts.


               STEP 1 Twist the rope twice to make two adjacent crossing turns.




















               STEP 2 Pull down the outer turn.






















               STEP 3 Bring the middle of the loop up through the center of the other
               crossing turn.
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