'-Ml. J, I II II II 111! 



'. n n r n 



k 



I 1 I • I I I I I I II HfflH 



n n n "i n n 



F "' 





T 



Figure 7. — Original lines of Robert Fulton's Steam Battery, a Danish copy dated September 

 12, 1817; found in Rigsarkivetj Gopenhagen. 



close to the ends of the ship. Tiller ropes led from a 

 tackle under the gun deck through trunks to the spar 

 deck, where the wheels were placed. This allowed 

 proper sweep to the tillers and operation of each pair 

 of rudders. The paddle wheel w r as apparently of 

 iron, with wooden blades, and agrees with Montgery's 

 description. In the plan for the model it is shown 

 raised 18 inches above the original design position, to 

 agree with trial requirements. 



It should be observed that the close <£-to-<£ frame 

 spacing created a hull having frames touching one 

 another, at least to above the turn of the bilge, so 

 the \ essel was almost solid timber, before being 

 planked and ceiled, from keel to about the loadline. 

 The sides arc not only heavily planked but, after 

 the frames were ceiled with extraordinarily heavy, 

 square timbering, a supplementary solid, vertical 

 framing was introduced inboard and another ceiling 

 added. The sides scale about 5 feel from outside 

 the plank to the inboard face of the inner ceiling 

 ii the level of the gunports. 



The hulls were tied together athwartship by the 

 deck In .mis of the gun deck and spar deck, except in 

 the wake of the paddle wheel. Knees were placed 

 along the sides of the race at alternate gun-deck beams. 

 In addition, the 12 1 -foot-square timbers, crossing 



the race at the rabbets of the hulls, (mentioned by 

 Montgery) are shown. These must have created 

 extraordinary resistance, even at the low speed of 

 this steamer. The deck details shown arc the results 

 of reconstruction of the inboard works. 



History of Double-Hull Craft 



The use of catamaran hulls, or "double-hulls," 

 has been periodically popular with ship designers 

 since the time of Charles II of England. The earliest 

 of such vessels known in the present day were four 

 sloops or shallops designed 1673 1687 b) Sir William 

 Petty, who was an inventor in the field of naval 

 architecture and received some attention from Charles 

 II and from the Royal Society. 



The first Pett) experiment, the Simon & Jude, 

 lattei called Invention /, was launched October 28, 

 1662. She was designed with two hulls cylindrical 

 in cross section, each 2 feet in diameter, and 20 feet 

 long. A platform connected the hulls, giving the 

 liu.it .1 beam of a little over 9 feet. She had a 20- 

 foot mast stepped on one of the crossbeams connecting 

 the hulls, with a single gaff sail. In sailing trials 

 she be.it three last boats: the King's barge, a large 

 pleas ire boat, and a man-of-war's boat. This 



152 



lit I IK I IN 210: CONTRIBI I'lONS ['ROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



