People have used hunting dogs to help chase down and retrieve animals, and birds of prey to catch birds and mammals, while tethered cormorants have been used to catch fish.
Leaving the pioneer to settle himself under the net, the man gathered his animals and tethered them under the platform for protection against jungle marauders.
These devices are usually not tethered to earth ground, but instead incorporate high resistance in their construction, and work by dissipating electrical charge to special floor tiles.
He holds several patents and is the author of nearly 100 publications in aircraft, spacecraft, electrodynamic tethers, SETI, and global climate control.
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The islands are loosely tethered in place by a long rope anchored to the lake bed, though in 2010, the anchors were strengthened after an unusual gale tore more than 40 of the islands from their locations and blew them several miles away.