Now, as the lightning rod to a spire on shore is intended to carry off the perilous fluid into the soil; so the kindred rod which at sea some ships carry to each mast, is intended to conduct it into the water. But as this conductor must descend to considerable depth, that its end may avoid all contact with the hull; and as moreover, if kept constantly towing there, it would be liable to many mishaps, besides interfering not a little with some of the rigging, and more or less impeding the vessel's way in the water; because of all this, the lower parts of a ship's lightning-rods are not always overboard; but are generally made in long slender links, so as to be the more readily hauled up into the chains outside, or thrown down into the sea, as occasion may require.