Abstract: A stabilization system for ships having two tanks for the storage of liquid connected by a cross-over duct. The tanks are located close to one another on either side of the fore and aft center line of the ship. The cross-over ducts are spaced from the bottom of the tanks so that only a portion of the liquid in the tanks moves from one tank to the other during rolling of the ship. The ducts contain valves which can be used to tune the system or to shut it down.

Abstract: A boom is mounted for pivotal movement about two orthogonal axis. Rotation about the horizontal axis is provided by a sealed boom pivot bearing utilizing a floating bearing pin in an oil filled enclosure. Vertical loads and side thrust forces are accommodated by a second sealed bearing utilizing a bearing post received in a cylindrical bearing enclosure. Vertical thrust is absorbed by a sliding bearing relationship between the bottom of the bearing post and an end plate on the cylindrical enclosure. Side thrust is accommodated by a sliding bearing relationship with the walls of the enclosure. A supplemental vertical thrust bearing is provided at the upper end of the cylindrical enclosure.