There is the transmission of power by means of a round, endless rope, running at high velocity over a series of sheaves or pulleys, carrying power to a distance of three miles; there is underground haulage, for which five distinct types of rope are used, enabling the engineer to make light of grades, even with staggering loads; logging, in which, in the primeval forests of the Northwest, the horse or ox is a pigmy, and where the giant trunks, seven, eight or nine feet in diameter, are whisked up at the sides of mountains, hoisted into the air and deposited on cars, to be run down to the rivers on steep inclines, again operated by rope of great size and strength. There is quarrying, where rope is used in quantity for guying, and for hoisting the blocks of stone out of their beds, and then on aerial cable ways, to carry them on high over long distances to be loaded; there are the oil fields, in which just now, in the mad search for petroleum to supply the world's shortage, interminable miles of wire rope are being used, some of it an inch thick or over, to carry the drills, or for casing and sand lines. There is shipping--the battleship and the merchantman and the liner; the yacht, the riverman and the tug--all strung with wire rope from stem to stern, and some of them from truck to keel as well--not to mention mooring lines which have their own plan and formula; there is towing, to which wire rope brought new possibilities and freedom from old troubles and old perils--witness the towing of the dry dock "Dewey" from Chesapeake Bay to the Philippines, thirteen thousand miles, on a pair of 1200 foot Roebling hawsers, which stuck to their jobs without interruption, through all sorts of weather, and lugged their burden into the harbor of Olongapo without a sign of weakness or exhaustion; there is dredging, for which wire rope has largely supplanted the old and cumbrous chain which was never any stronger than its weakest link. There is hardly an important harbor in the world today where these stout ropes are not busy clearing pathway and anchorage for marine commerce. [Sidenote: MORE USES OF WIRE ROPE]