Stadt Zürich (ship, 1855) a few minutes. Thirteen men and eleven head of cattle died in this accident, making the sinking of the "Ludwig" by the "Stadt Zürich" the most serious shipping accident known at that time that had happened on Lake Constance. One consequence of the investigations into the disaster was an improvement in the signal regulations: in addition to the white bow light a green starboard and a red port light had to be carried. After the Bavarian ship, the "Ludwig" had sunk, the "Jura" was bought as a replacement, a ship which hitherto had worked on Lake Neuchâtel. She was dismantled,
Ship motions or "roll axis", is an imaginary line running horizontally through the length of the ship, through its centre of gravity, and parallel to the "waterline". A roll motion is a side-to-side or port-starboard tilting motion of the superstructure around this axis. There are three special axes in any ship, called vertical, transverse and longitudinal axes. The movements around them are known as roll, pitch and yaw. There are methods for both passive and active motion stabilization used in some designs. They include static hull features such as skegs and bilge keels, or active mechanical devices like counterweights, antiroll tanks and