Purpose: A tripod can be used to support a load such as a water jug, camping stove, etc.
Tying: Start with a Clove Hitch around one pole. Wrap about six racking turns around the three poles weaving in and out between them. Make two or three tight frapping turns in the two gaps. Finish with a Clove Hitch. Cross the two outside poles to form the tripod.
Animated Knots: http://www.animatedknots.com/lashtripod/