Figure 12.
Miller later turned to the idea of employing steam instead of manual power and built a 25-foot double-hulled pleasure boat of iron fitted with a steam engine built by William Symington. Also named Experiment, she was an apparent success, so Miller had a 60-foot boat built of the double-hull design and fitted with an engine built by Symington. She reached a speed of 7 mph on the Forth and Clyde Canal. However, Miller lost interest when he found that the Symington engine was unreliable and that Great Britain showed very little public support for such projects.
Fulton was acquainted with Symington’s work and probably had heard of Miller’s vessels. At any rate, he employed the double-hull principle in his steam ferryboats, the first of which was the Jersey, a 188-ton vessel built by Charles Browne, which began service July 2, 1812. The next year he had a sister ship built, the York. These vessels were based on his patent drawing of 1809. In 1814 he had another vessel of this type built, the Nassau. It was, therefore, logical that he should apply this design to the Steam Battery. The double-hull design had worked well in these ferries, and the design would give protection from shot to the paddle wheel. The Battery would have the ability to run forward or astern so as not to be exposed to a raking fire from the enemy while maneuvering in action. The application of this “ferryboat” principle to the Battery reduced the need for extreme maneuverability, the catamaran’s weakest point, even at low speed.
The resistance factors in the design are of relatively small importance, for the speed possible under steam in this period was very low. However, the plans show an apparently efficient hull form for the power available, aside from the drag of the beams across the race in the vicinity of the keel. The displacement was adequate. The height of the gun-deck above the water at the race made the Battery unsuitable for rough-water operation, but there is no evidence that Fulton or the sponsors of the vessel considered the Battery as a coastwise or seagoing steamer. However, the clearance of the gun deck above the water and the dip of the paddle wheel would have made the additional weight of an upper- or spar-deck battery prohibitive even had experience in action proven it desirable.
