So [Assembly 



The submarine boat can safely descend to navigate, or remain 

 stationary under the water, at the depth of from ten to one 

 hundred feet, with or without a direct or indirect communication 

 with the exterior. 



The crew consists of from three to six men, who can remain, 

 without inconvenience, from four to seven hours under "water 

 without ascending, or ascend at their pleasure. The air which 

 they breath, is purified by a pump, which absorbs the carbonic 

 acid, and gives out the oxygen in a condition favorable for the 

 lungs. 



The pressure of the wholesome air in the cabin,not being above 

 two and one-half atmospheres for one hundred feet of depth, is 

 supportable seven or eight hours without fatigue. 



The boat may be conveniently employed to explore the bottoms 

 of rivers, lakes, and harbors, either to examine reefs, or to mine 

 them with a view to their removal. It may also be employed in 

 submarine fisheries for pearls, lor examining sunken vessels, 

 mining for gold, &c. 



It may also be used very advantageously in laying wire for 

 telec^raphs, and in the salvage of sunken vessels. For these 

 operations, it may accomodate a crew of seven men. 



The construction of a Submarine Vessel will cost about 5,700 

 or 6,000 dollars, and for extraordinary occasions, may be con- 

 structed upon a larger scale. 



This apparatus may in time be rendered the means of effecting 

 great services to the navy department, for exploring the bottom 

 of ports, inspecting docks, securing dams, inspecting the founda- 

 tions of bridges, building up submarine constructions, carrying 

 cements and materials to the bottom of basins, looking for break- 

 ers, studying the coasts, making submarine maps, ascertaining 

 currents, looking for wrecked persons, &c. 



It is intended for gold and commercial marine searching; also 

 for fishing for pearls, mother of pearls, coral, sponges; recovering 

 property in sunken ships, blasting rocks, putting at the bottom of 

 rivers and preserving from any accidents, the wires of magnetic 

 telegraphs, S:c., &c. 



