These are marvels of a modern age. But, a very long time ago, the only way was by sail. Usually made of a canvas or hide fabric and were very large, and often difficult to keep clean. With the passing of time, and mechanical engineering, the shipping industry has taken an enormous growth potential. Now, this was not obviously easy.
Evolution comes sometimes at a very high cost.
And nobody, understood, how or why she worked. Because of the newness of her steam engines. She had 1 steam engine, and sails. But, NO propellers. She had paddle-wheels.