One of the most underated knots in Scouting and Guiding, the Tautline hitch is used to attach one rope to a second, in such a manner that the first rope can be easily slid along the second. The knot can be connsidered a Clove hitch with an additional turn.  When tension is applied and the ropes form a straight
line, the tautline hitch will lock  onto the first rope. When the tension is released, the hitch can be
loosened and slid along the first rope to a new location.  The tension must be applied on the side of the knot with the extra turn.

Tip. Use this knot if you have a guy rope with no adjuster. Create a loop on the end of a second rope
which is slipped over the peg. Use a rolling hitch to attach the second rope to the guyline. Alternatively,
take the guyline around the peg and tie the Rolling hitch  back onto the standing part of the guyline, above
the peg, thus forming an adjustable loop.

Tip. Use this knot when constructing camp gadgets such as a suspended table. A Tautline hitch in each
suspension rope will allow easy adjustment and a level table!

Tip. When adjustments are complete, lock the tautline hitch into place by using a stop knot such as a
Figure of Eight in the first rope, below the Tautline hitch, to stop it slipping.