**Beginning in the 1910s, nations all over the world experimented with ship designs & layouts culminating in the ''aircraft carrier''. Issues such as exhaust layout, aircraft elevators, command bridges, ship weaponry, and so forth vastly differed between classes and even within classes. | **Beginning in the 1910s, nations all over the world experimented with ship designs & layouts culminating in the ''aircraft carrier''. Issues such as exhaust layout, aircraft elevators, command bridges, ship weaponry, and so forth vastly differed between classes and even within classes. |