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[167] by a vertical depth of six feet, the figures being approximate only. Access to the interior was had by two man-holes in the upper part, covered by hinged caps, into which were let bull's eyes of heavy glass, and through these the steersman looked in guiding the motions of the craft. The boat floated with these caps raised only a foot or so above the level of the water. The motive power was a propeller, to be worked by hand of the crew, cranks being provided in the shaft for that purpose. Upon each side of the exterior were horizontal vanes, or wings, that could be adjusted at any angle from the interior. When it was intended that the boat should go on an even keel, whether on the surface or under, these vanes were kept level. If it was desired to go below the water, say, for instance, at an angle of ten degrees, the vanes were fixed at that angle, and the propeller worked. The resistance of the water against the vanes would then carry the boat under. A reversal of this method would bring it to the surface again. A tube of mercury was arranged to mark the depth of descent. It had been the design of the inventor to approach near to an enemy, then to submerge the boat and pass under the ship to be attacked, towing a floating torpedo to be exploded by means of electricity as soon as it touched the keel. Insufficient depth of water in the harbor prevented this manner of using the boat, however, and so she was rigged with a long spar at the bow, to which a torpedo was attached, to be fired by actual concussion with the object to be destroyed. This change necessarily made the boat more unwieldy, and probably had something to do with the tragic circumstances of her after history.

It will be remembered that she was sunk at the wharf at Fort Johnson by the waves from a passing steamer, while a part of the crew were in her. Days elapsed before she could be raised. The dead were removed, and a second crew volunteered. They made repeated and successful experiments in the harbor, but finally they, too, went down, and, from some unknown cause, failed to come up. Once more a long time passed before the boat was raised, and then the poor remains of the devoted crew were taken from her in an indescribable condition. Yet, still another set of men came forward and volunteered for the duty. Surely love of country and courage of the sublimest type never found better exponents than these. The expedition started, but did not return. That night the sloop of-war, Housatonic, was reported as having been sunk by a torpedo in the lower harbor, but of the gallant men who had thus accomplished what they aimed to do, nothing definite was ever known until after

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