HYPERBOLA. One of the conic sections formed by cutting a cone by a plane which is so inclined to the axis, that when produced it cuts also the opposite cone, or the cone which is the continuation of the former, on the opposite side of the vertex.
HYPOTHECA. A mortgage. In the civil law, was where the thing pledged remained with the debtor.
HYPOTHECATION. An authority to the master, amounting almost to a power of the absolute disposal of the ship in a foreign country; he may hypothecate not only the hull, but his freight and cargo, for necessary and urgent repairs.
HYTHE. A pier or wharf to lade or unlade wares at [from the Anglo-Saxon hyd, coast or haven].
I.
I. The third class of rating on Lloyd's books, for the comparative excellence of merchant ships. (See [A].)
ICE-ANCHOR. A bar of round iron tapered to a point, and bent as a pot-hook; a hole is cut in the ice, the point entered, and the hawser bent to the shorter hook; by this vessels ride safely till any motion of the ice capsizes it, and then it is hauled in. The ice is usually entered by a lance, which cuts its hole easily.
ICE-BEAMS. Strengtheners for whalers. (See [Fortifying].)