Bowline on a bight advocate the use of a figure eight twisted version of the Bowline on a bight. This knot can be used to provide a toe hold in the middle of a rope; to make an emergency bosun's chair; and to create an upper rope "block" to make a crude purchase by threading the rope round an anchor point and then back up through the loop. It is sometimes used in sport climbing to tie into two anchor bolts independently. This knot is convenient when a dependable loop is required but neither end of the line is available. It's also commonly used
USS Tom Bowline (1814) — only to be driven off by a gale. "Hornet" arrived five days later, but her landfall coincided with the appearance in the area of British brig-sloop . The two ships closed for action, and "Hornet" damaged "Penguin" seriously enough to warrant destruction of the Briton. The sighting of strange sail on the horizon hastened "Hornet's" burning of the prize, but apprehension turned to relief as the sails proved to be "Peacock" and "Tom Bowline" returning to Tristan da Cunha for the planned rendezvous. "Tom Bowline" embarked the "Penguin's" captive crew and took the prisoners to Rio de Janeiro, Brazil.