Denver.—Robert Lincoln, a negro inventor of this city, has perfected an entirely new type of submarine craft, which is to be brought to the attention of the war department by a number of capitalists who have become interested in the invention. If Lincoln's principles work out as well in the trial boat as they do in the model, there is no doubt that he has solved the problem of under water navigation. He gives the following details concerning his unique craft:
“My invention will not only prove an improvement in submarine navigation, but will introduce a new mode of propulsion, which may be applied to all water craft, whether running on or beneath the surface of the water,” the inventor says.
“It can be steered or controlled with as much ease and safety in rough as in calm seas. Observation can be taken as accurately while the boat is wholly submerged as when on the surface by a system of mirrors and refracted rays, only exposing an eight-inch pipe to view.
“The boat is agile, swift and durable. It will stand the pressure of the water at any depth. By the application of hydroplanes, keel, and turrets, we are able to do away with the propeller and its ponderous machinery, absolutely necessary to get speed from the style now in vogue.
“The revoluble hull is the greatest achievement of the invention. It has a spiral arranged blade encircling it from end to end, resembling a corkscrew. When this hull is set in motion upon its axis this blade coming In contact with a great surface of warter, the forward movement of the boat is smooth.
The inner boat, being carried by the outer boat, does not come in contact with the water, and can offer no resistance to its speed or momentum.