Page 77 - Gibson W.B. "The complete guide to knots"

fig. 1

The Catshank

Similar to the Sheepshank in
appearance and purpose, this also can
be made in the center of a long rope
without using the ends, which makes
it very practical for specific purposes.
To form the Catshank, tie two
Running Knots or simple Slip Knots a
foot or more apart. Double the rope
between them to form opposite bights
as with the Sheepshank. Draw the
bights through those opposite knots
until the rope is suitably shortened
(fig. 1). Then pull the knots tight by
tugging the main portions of the rope
toward the ends.
This final action gives an excellent
idea of the strength and resistance of
the Catshank.

fig- 2