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is pumped out of each wrecking vessel by means of the steam pumps which are carried on each boat. Each boat being now lightened will rise and the sunken boat will be carried clear of the bottom so as to swing on the supporting chains. The two vessels are now moved in toward shoaler water until the wreck grounds. These operations are continued until the wreck has been raised sufficiently to be relieved of its cargo and pumped out. As is well known, the operation of raising submerged wrecks can be greatly facilitated by working with the tide, so as to pump the water into the wrecking vessel on a low tide, or when the tide is going out, and pumping the water out of each wrecking vessel on a high tide. A. MoDOUGALL. No. 498,878. Patented May 30, 1893. rr- My present invention relates ... particularly to improvements in ____________________________________ the means and methods of mounting guns within war vessels. Among the advantages which I attain is... to mount them as to normally secure a low center of gravity of the boat, and at the same time, bring the guns when being loaded within ready access to the powder and shot magazines, and to expose as small a portion as possible of the guns to the action of shot and shell from the enemy. The manner of operating and handling the gun with this improved apparatus, supposing that two guns are being used, is as follows: the port gun is loaded at the lower end of track Q, and is moved up thereon, and is swung over to the track Q' so as to open the hinged nose P of the boat. The port gun will now point directly ahead and is then fired, after which it is allowed to move down the track Q1. While the port gun is being moved up the tracks and fired, the starboard gun is being loaded, so that when the port gun is brought back, the starboard gun is moved up...when it is fired in a manner similar to the port gun. The two guns are therefore fired in alternation, so that a very rapid and effective fire can be kept up. It may be a desirable arrangement to connect the guns together, so that one gun in moving down the inclined track will help to move the other gun up the same. The aiming of the guns is accomplished both by the pilot or steersman and by the gunner within the hold, the former accomplishing the horizontal aim by keeping the nose of the boat pointing directly at the enemy, and the latter accomplishing the vertical aim of the gun. 2 Sheets--Sheet 1. A. MoDOUGALL. HEARS FOR HANDLIEO AND FIBIRO 0UH8 ON SHIPS. No. 498,678. Patented May 30, 1893.